Trek: Accessories

Ride Farther Hammer out big days with Range Extender. This compact back-up battery adds 160Wh of power to extend your range by up to 44%. It fits neatly in a standard water bottle cage in the inner triangle, where there's a short reach to the charge port, and secures in place with its included strap — no additional hardware required. Product details - 160 Wh battery - Charge port enables charging both bike and range extender simultaneously - LED battery level indicator - Includes Range Extender user manual - Ships to retailer. Not returnable. - Retention strap and charge cable are required and sold separately

Upgrade or refresh your bike.

An elevated classic Trek RSL Road Cycling Shoe is a pro-level shoe that couples classic aesthetics with game-changing tech for an exceptionally fast, comfortable, and lightweight shoe. Trek RSL Road Cycling Shoe is professional pedigree through and through. An expertly crafted traditional upper and innovative new tech vastly improves comfort and performance, elevating your every attack, breakaway, and sprint. Game-changing METNET relief zones give flex where it's needed most. A 100% OCLV Carbon plate delivers superior power transfer for maximum efficiency. Dual Li2 BOA dials provide a dialed, precision fit, ensuring even more comfort and support. - METNET relief zones stretch and conform to the foot to relieve common foot discomfort - Updated Trek Pro Last provides a wider performance fit that better matches the average foot - Dual Li2 BOA dials provide low-profile, on-the-fly micro-adjustability for a precision fit - 100% OCLV Carbon plate provides excellent power transfer for optimal pedaling efficiency - External heel cup and no-slip heel lining prevent slippage and improve efficiency - Perforations throughout the upper and three vents within the sole provide excellent breathability - Insoles are made with Rise by BLOOM, a bio-based EVA foam replacement - Compatible with 3-bolt cleats

An all-around, road racing helmet that is light, cool, fast, and features the added protection of Mips. Velocis Mips is now lighter, cooler, and faster than ever thanks to insight and feedback from Trek-Segafredo. And with a full suite of pro-level features, this helmet is bound for the podium. Velocis is designed with protection front and center. This helmet earned a Virginia Tech 5-STAR safety rating and features a Mips Air safety system.

GENUINE REPLACEMENT PARTS Get back on the road with genuine replacement parts. PRODUCT DETAILS - Keep your bike fresh - Includes routing port for rear light

GENUINE REPLACEMENT PARTS Get back on the road with genuine replacement parts. PRODUCT DETAILS - Keep your bike fresh - Includes routing port for rear light

A new standard Trek Velocis Road Cycling Shoe is a high-performance road shoe designed for committed cyclists who need power and everlasting comfort on every road ride, no matter the distance. All-new METNET relief zones deliver flex in all the right places. Two Li2 BOA dials provide a secure and precise fit. A carbon composite plate ensures excellent power transfer.

A high-performance bike jersey built with premium materials in an aerodynamic cut. Pro-issue performance You've put in the time and dedication, now it's time to upgrade your kit to match. The RSL Cycling Jersey is built with our best fabrics and a next-to-skin Pro Fit that's developed for serious riders and racers.

Our best pair of lights. Daytime running lights for visibility, and Kindbeam that lights the way while staying out of oncoming riders' eyes. Do the (b)right thing A ready-for-anything light set that pairs Daytime Running Light visibility with the bright commuter Pro RT front light. Kindbeam keeps more light on the path ahead of you while avoiding oncoming riders' eyes, for a bright light that won't blind oncoming riders. It's equipped with a visible fuel gauge, wireless connection to tail light, and charge-back that allows you to use the light as a battery bank to charge gadgets. All buttoned up with a Flare RT for the top light package for any ride. - See and be-seen light set for everything you need to ride with lights every ride, day or night - Commuter Pro RT with Kindbeam keeps light on the ground ahead of you and out of oncoming riders' eyes - Flare RT provides ultimate visibility for any road, city, or path - Specifically designed focus, flash, and range flash patterns for daytime visibility for up to 2km - Commuter Pro modes: high 1000LM — 1.5hrs, low 500LM — 3hrs, day flash 300 LM — 12hrs - Flare RT Flash modes: 90LM — 6hrs, 45LM — 12hrs, 5LM — 15hrs, Steady modes: 25LM — 4.5hrs, 5LM — 13.5hrs - Blendr-compatible for integrated mounting on compatible Blendr stems, helmets, and helmet mounts - USB-rechargeable with included USB-C and micro USB cable

An eco-conscious women's bib short made with luxurious compressive materials that provide comfort during long, hard rides. You deserve the best Don't settle for anything less than the best. The Velocis Women's Cycling Bib Short is ready to lead the pack by delivering comfortable compression for lasting performance and it's built with premium materials with our most breathable Pro Inform Chamois. Great for rides up to 2.5+ Hours / 50+ Miles / 80+ KM - An eco-conscious women's bib short made with luxurious compressive materials that provide comfort during long, hard rides. - bluesign product and STANDARD 100 by OEKO-TEX tested - Pro inForm Chamois—Our most breathable chamois that delivers serious performance and premium comfort - Lightweight, breathable fabric balances compression and comfort - Low profile bib straps with high elasticity prolongs the life of the shorts - Raw edge leg opening for seamless compression through hip and leg - Premium silicone leg grippers keep shorts in place while pedaling - UV protection 50+ - Fitted cut provides a streamlined body fit for enhanced performance Made with love for you and the planet The Velocis Short is a bluesign product that's been STANDARD 100 tested by OEKO-TEX. Pro inForm chamois Our most breathable chamois hugs your body in all the right ways to deliver serious performance and premium comfort for rides beyond 2.5 hours. Luxurious materials Velocis is made with lightweight, breathable materials that balance compression and comfort. Low-profile, long-lasting High-elasticity materials prolong the life of the straps, and a low-profile design provides a seamless fit. Raw-edge leg opening A raw-edge leg opening offers seamless compression through the hip and leg. UV50+ Velocis fabrics are built to help you shine while reducing your exposure risk by offering UV50+ protection. How to care for your shorts Caring for your shorts will prolong their life, keep you fresh, and help eliminate odors to keep your ride partners happy. Wash in cold water on a gentle cycle and hang to dry.

An eco-conscious bib short made with luxurious compressive materials that provide comfort during long, hard rides. Don't settle for less Don't settle for anything less than the best. The Velocis Cycling Bib Short is ready to lead the pack by delivering comfortable compression for lasting performance and it's built with premium materials with our most breathable Pro Inform Chamois. Great for rides up to 2.5+ Hours / 50+ Miles / 80+ KM - An eco-conscious bib short made with luxurious compressive materials that provide comfort during long, hard rides. - bluesign product and STANDARD 100 by OEKO-TEX tested - Pro inForm Chamois—Our most breathable chamois that delivers serious performance and premium comfort - Lightweight, breathable fabric balances compression and comfort - Low profile bib straps with high elasticity prolongs the life of the shorts - Raw edge leg opening for seamless compression through hip and leg - Premium silicone leg grippers keep shorts in place while pedaling - UV protection 50+ - Fitted cut provides a streamlined body fit for enhanced performance Made with love for you and the planet The Velocis Short is a bluesign product that's been STANDARD 100 tested by OEKO-TEX. Pro inForm chamois Our most breathable chamois hugs your body in all the right ways to deliver serious performance and premium comfort for rides beyond 2.5 hours. Luxurious materials Velocis is made with lightweight, breathable materials that balance compression and comfort. Low-profile, long-lasting High-elasticity materials prolong the life of the straps, and a low-profile design provides a seamless fit. Raw-edge leg opening A raw-edge leg opening offers seamless compression through the hip and leg. UV50+ Velocis fabrics are built to help you shine while reducing your exposure risk by offering UV50+ protection. Your guide to shorts Never worn cycling shorts before? Check out this guide to getting the most out of an essential piece of cycling equipment. How to care for your shorts Caring for your shorts will prolong their life, keep you fresh, and help eliminate odors to keep your ride partners happy. Wash in cold water on a gentle cycle and hang to dry.

A lightweight waterproof jacket with excellent breathability that is easily packable if the rain subsides. No more rainchecks Reach for the Circuit Rain Cycling Jacket when the forecast is questionable. Its ultralight design makes it easy to stow when not needed and a unique water-blocking membrane features a 10,000mm waterproof and 10,000g/mm2 breathability rating for elemental protection. Taped seams with a waterproof two-way YKK zipper keeps water out and allows access to jersey pockets without having to fully unzip. Plus, an additional drawstring at the waist and cuffed arm gusset allow easy fit adjustments and an extra level of protection from water seeping in. Product details: - bluesign® product and STANDARD 100 by OEKO-TEX® tested - Water-blocking membrane and moisture-wicking inner layer keep you warm and dry - 10,000mm waterproof and 10,000g/mm2 breathability - Ultra-light design easily packs into a jersey pocket - Taped seams with waterproof two-way YKK zipper keeps water out and allows access to jersey pockets - Fine-tune fit with integrated waistband drawstring - This product saves the equivalent of 31 PET plastic water bottles - Fitted cut provides a streamlined fit with room to layer - Temperature use (high): 85°F (29°C) - Temperature use (low): 50°F (10°C) - Water resistant: Yes - Fiber content: 90% Recycled Polyester / 10% Spandex Features: Made with love for you and the planet The Circuit Rain Jacket is a bluesign® product that's been STANDARD 100 tested by OEKO-TEX®. Breathable protection from the elements A water-blocking membrane and moisture-wicking inner layer keep you warm and dry and is rated for 10,000mm waterproofing and 10,000g/mm2 breathability. Seam-sealed Taped seams with waterproof two-way YKK zipper keeps water out and allows access to jersey pockets. No entry zone A cuff arm gusset prevents water from entering up the sleeve when hammering through the rain. Pack 'n go The ultra-light design easily packs into a jersey pocket when the rain subsides. How to care for your jacket Caring for your jacket will prolong its life, keep you fresh, and help eliminate odors so your ride partners stay happy. Wash in cold water on a gentle cycle and hang to dry.

A lightweight waterproof jacket with excellent breathability that is easily packable if the rain subsides. Don't let it rain on your parade Reach for the Circuit Women's Rain Cycling Jacket when the forecast is questionable. Its ultralight design makes it easy to stow when not needed and a unique water-blocking membrane features a 10,000mm waterproof and 10,000g/mm2 breathability rating for elemental protection. Taped seams with a waterproof two-way YKK zipper keeps water out and allows access to jersey pockets without having to fully unzip. Plus, an additional drawstring at the waist and cuffed arm gusset allow easy fit adjustments and an extra level of protection from water seeping in. Product details: - bluesign® product and STANDARD 100 by OEKO-TEX® tested - Water-blocking membrane and moisture-wicking inner layer keep you warm and dry - 10,000mm waterproof and 10,000g/mm2 breathability - Ultra-light design easily packs into a jersey pocket - Taped seams with waterproof two-way YKK zipper keeps water out and allows access to jersey pockets - Fine-tune fit with integrated waistband drawstring - This product saves the equivalent of 30 PET plastic water bottles - Fitted cut provides a streamlined fit with room to layer - Fit profile: Semi-fitted - Temperature use (high): 85°F (29°C) - Temperature use (low): 50°F (10°C) - Water resistant: Yes - Fiber content: 90% Recycled Polyester / 10% Spandex Features: Made with love for you and the planet The Circuit Rain Jacket is a bluesign® product that's been STANDARD 100 tested by OEKO-TEX®. Breathable protection from the elements A water-blocking membrane and moisture-wicking inner layer keep you warm and dry and is rated for 10,000mm waterproofing and 10,000g/mm2 breathability. Seam-sealed Taped seams with waterproof two-way YKK zipper keeps water out and allows access to jersey pockets. No entry zone A cuff arm gusset prevents water from entering up the sleeve when hammering through the rain. Pack 'n go The ultra-light design easily packs into a jersey pocket when the rain subsides. How to care for your jacket Caring for your jacket will prolong its life, keep you fresh, and help eliminate odors so your ride partners stay happy. Wash in cold water on a gentle cycle and hang to dry.

Our best light, bright enough for trail riding, and with Kindbeam to keep light on the trail and out of oncoming riders' eyes. Do the (b)right thing A do-it-all front light that's powerful enough for off-road riding. Kindbeam keeps more light on the trail ahead of you while avoiding oncoming rider's eyes, for a bright light that won't blind other trail users. A visible fuel gauge, wireless connection to tail light, and Charge-back that works as a battery bank for charging gadgets, round out an industry-leading set of features and make this our best front light option. - Commuter Kindbeam keeps light on the ground ahead of you and out of oncoming riders' eyes - 1000 Lumen high beam setting lights up full path or trail, ideal for use as MTB light - Wirelessly pair with Flare RT for single-button power-up on both front and rear light - Dual fuel gauge clearly shows available battery life and battery life of paired light - USB-C charging port supports chargeback for recharging phone or cycling computer on-the-go - DRL-specific focus, flash, and range flash patterns offer ultimate daytime visibility - Runtimes: high 1000LM — 1.5hrs, low 500LM — 3hrs, day flash 300 LM — 12hrs - Includes Commuter Pro RT light, Adjustable hard mount, and USB-C charging cable

A durable, carry-everything full frame pack that installs quickly to let you adventure farther. - Available in four sizes to best fit more frames and adventures - Mount with thumb screws (sold separately) to bikes with integrated boss mounts - Large main pocket and smaller compartment pocket make it easy to stay organized - Gold lining and internal mesh pockets make finding your gear a cinch - Water-resistant construction helps keep your gear dry - Durable materials and robust zippers are designed to last

A stylish road helmet with advanced WaveCel technology that balances comfort and performance for all riders who value safety. Starvos WaveCel is a versatile, high-value cycling helmet for new-to-seasoned riders who want WaveCel, a leading technology in the protection against cycling-related head injuries. WaveCel is a collapsible cellular structure that lines the inside of the helmet. This Trek-exclusive technology disrupts the safety standards the industry has accepted for over 30 years.

Trek's most versatile bib short ever The Circuit Cycling Bib Short is one that everyone should keep in their cycling wardrobe. Circuit is ultra-versatile and is built with lightweight, breathable main materials for an optimal balance of compression and breathability. The form-fitting dual-density Elite inForm Chamois provides comfort for miles with guaranteed smiles. Great for rides up to 2.5 Hours / 35 Miles / 56 KM Made with love for you and the planet The Circuit Short is a bluesign product that's been STANDARD 100 tested by OEKO-TEX. Elite inForm chamois This form-fitting, dual-density pad provides an optimal balance of performance and comfort for rides up to 2.5 hours. Low-profile, long-lasting High-elasticity materials prolong the life of the straps, and a low-profile design provides a seamless fit. Raw-edge leg opening A raw edge cuffed leg opening offers a comfortable, more flattering fit around the legs. Get a grip Low-profile silicone-printed leg grippers keep your shorts in place while you're pedaling hard. UV50+ Circuit fabrics are built to help you shine while reducing your exposure risk by offering UV50+ protection. Men's Fitted Profile

The most versatile, eco-conscious bike short with the added support of bibs, designed for riders seeking all-day comfort. The Circuit Women's Cycling Bib Short is one that everyone should keep in their cycling wardrobe. Circuit is ultra-versatile and is built with lightweight, breathable main materials for an optimal balance of compression and breathability. The form-fitting dual-density Elite inForm Chamois provides comfort for miles with guaranteed smiles and the low-profile bib straps are built around shaped mesh that allow for easy bathroom breaks.

An eco-conscious padded bike short packed with ultra-versatile features for the trail and beyond. Hit the trail and relax in comfort post-ride with the Evoke Mountain Short. Built with a durable two-way stretch shell and removable padded liner, this short is perfect for all of your on- and off-bike adventures.

More performance, less impact. Hit the trail and relax in comfort post-ride with the Evoke Women's Mountain Short. Built with a durable two-way stretch shell and removable padded liner, this short is perfect for all of your on- and off-bike adventures. Details: - An eco-conscious women's padded bike short packed with ultra-versatile features for the trail and beyond. - A woven two-way stretch outer-short moves with your body - Removable padded liner adds versatility for going from trail to town - A lightweight chamois wicks moisture and provides excellent breathability - A dual-sided hook-and-loop waist closure lets you easily fine-tune your fit - A vented leg opening moves with your pedal stroke - A zippered right back pocket offers secure storage - This product saves the equivalent of 17 PET plastic water bottles - A semi-fitted cut follows the curves of your body and leaves room for movement

Flat pedals are the preferred choice of many downhillers, dirt jumpers and enduro riders, but any trail rider can reap the benefits of a pedal born from the demands Trek's elite MTB riders. The Line Pro Flat Pedals deliver a concave body and solid platform with traction pins that mean every time you place your foot, your shoe stays put. Lift off at any moment knowing you can stamp back down on the gas and find firm placement.

An eco-conscious women's bike short made with technical fabrics and features that are ready for any trail. The Rhythm Women's Mountain Bike Short is built for your biggest adventures, with technical fabrics that are durable enough to stand up to the world's toughest trails. Explore more with a durable woven polyester shell with comfortable two-way stretch, a dual-sided daisy chain waist adjustment, extra deep and pockets, and a zippered side pocket so you don't lose your keys...again.

An eco-conscious short made with luxurious compressive materials that provide comfort during long, hard rides. Unleash your inner beast Don't settle for anything less than the best. The Velocis Cycling Bib Short is ready to lead the pack by delivering comfortable compression for lasting performance and it's built with premium materials with our most breathable Pro Inform Chamois. Great for rides up to 2.5+ Hours / 50+ Miles / 80+ KM - An eco-conscious short made with luxurious compressive materials that provide comfort during long, hard rides. - bluesign product and STANDARD 100 by OEKO-TEX tested - Pro inForm Chamois—Our most breathable chamois that delivers serious performance and premium comfort - Lightweight, breathable fabric balances compression and comfort - Wide waistband keeps shorts secure with even-pressure distribution - Raw edge leg opening for seamless compression through hip and leg - Premium silicone leg grippers keep shorts in place while pedaling - UV protection 50+ - Fitted cut provides a streamlined body fit for enhanced performance Made with love for you and the planet The Velocis Short is a bluesign product that's been STANDARD 100 tested by OEKO-TEX. Pro inForm chamois Our most breathable chamois hugs your body in all the right ways to deliver serious performance and premium comfort for rides beyond 2.5 hours. Luxurious materials Velocis is made with lightweight, breathable materials that balance compression and comfort. Wide, comfortable waistband A wide waistband keeps your shorts secure while evenly distributing pressure for extra comfort. Raw-edge leg opening A raw-edge leg opening offers seamless compression through the hip and leg. UV50+ Velocis fabrics are built to help you shine while reducing your exposure risk by offering UV50+ protection. How to care for your shorts Caring for your shorts will prolong their life, keep you fresh, and help eliminate odors to keep your ride partners happy. Wash in cold water on a gentle cycle and hang to dry.

A versatile softshell jacket that is wind-resistant and water-proof with an uber-soft fleece inside. Warmth prevails The Circuit Softshell Cycling Jacket is a simple yet sophisticated jacket to fend off the elements. It's built around a three-layer fabric that's wind-resistant and waterproof with excellent breathability. The brushed thermal interior is ultra-soft on the skin and provides the right amount of insulation, while three open-back pockets store all of your ride essentials, and a fitted cut provides a streamlined fit with room to layer. Product details: - bluesign® product and STANDARD 100 by OEKO-TEX® tested - 3-layer softshell is wind resistant, 8,000mm waterproof and 5,000mm breathability - Thermal rear panel is engineered for excellent warmth and breathability - Brushed thermal interior provides next-to-skin comfort and warmth - Two-way YKK zipper allows easy access to jersey pockets - Drop-tail design prevents overexposure when in the cycling position - This product saves the equivalent of 28 PET plastic water bottles - Fitted cut provides a streamlined fit with room to layer - Fit profile: Semi-fitted - Temperature use (high): 60°F (16°C) - Temperature use (low): 35°F (2°C) - Water resistant: Yes - Fiber content: Face: 100% Recycled Polyester, Back: 76% Nylon / 24% Spandex (exclusive of trims) Features: Made with love for you and the planet The Circuit Softshell Jacket is a bluesign® product that's been STANDARD 100 tested by OEKO-TEX®. Triple layer protection The three-layer softshell fabric provides wind resistance, 8,000mm waterproof, and 5,000mm breathability. Ultimate breathability A thermal rear panel is engineered for excellent warmth and breathability. Essential storage Three open-back pockets allow convenient access to ride essentials. Easy-access essential storage A two-way YKK zipper allows easy access to jersey pockets without disrobing. How to care for your jacket Caring for your jacket will prolong its life, keep you fresh, and help eliminate odors so your ride partners stay happy. Wash in cold water on a gentle cycle and hang to dry.

A versatile softshell jacket that is wind-resistant and water-proof with an uber soft fleece inside. Essential warmth The Circuit Women's Softshell Cycling Jacket is a simple yet sophisticated jacket to fend off the elements. It's built around a three-layer fabric that's wind-resistant and waterproof with excellent breathability. The brushed thermal interior is ultra-soft on the skin and provides the right amount of insulation, while three open-back pockets store all of your ride essentials, and a fitted cut provides a streamlined fit with room to layer. Product details: - bluesign® product and STANDARD 100 by OEKO-TEX® tested - 3-layer softshell is wind resistant, 8,000mm waterproof and 5,000mm breathability - Thermal rear panel is engineered for excellent warmth and breathability - Brushed thermal interior provides next-to-skin comfort and warmth - Two-way YKK zipper allows easy access to jersey pockets - Drop-tail design prevents overexposure when in the cycling position - This product saves the equivalent of 26 PET plastic water bottles - Fitted cut provides a streamlined fit with room to layer - Fit profile: Semi-fitted - Temperature use (high): 60°F (16°C) - Temperature use (low): 35°F (2°C) - Water resistant: Yes - Fiber content: Face: 100% Recycled Polyester, Back: 76% Nylon / 24% Spandex (exclusive of trims) Features: Made with love for you and the planet The Circuit Softshell Jacket is a bluesign® product that's been STANDARD 100 tested by OEKO-TEX®. Triple layer protection The three-layer softshell fabric provides wind resistance, 8,000mm waterproof, and 5,000mm breathability. Ultimate breathability A thermal rear panel is engineered for excellent warmth and breathability. Essential storage Three open-back pockets allow convenient access to ride essentials. Easy-access essential storage A two-way YKK zipper allows easy access to jersey pockets without disrobing. How to care for your jacket Caring for your jacket will prolong its life, keep you fresh, and help eliminate odors so your ride partners stay happy. Wash in cold water on a gentle cycle and hang to dry.

Choose your adventure. The Quantum Women's Fitness Bike Short is purpose-built for fitness and exploration, with versatile features and a semi-fitted cut that can take you from the trail to everyday life with ease. Details: - An eco-conscious padded women's bike short packed with features for on- and off-road exploration. - Two-way stretch polyester outer-short is durable and comfortably moves with you - A wide waistband with bungee drawcord allows for quick fine-tuning of fit - A lightweight chamois wicks moisture and provides excellent breathability - A Zippered side pocket offers secure storage - A vented leg opening moves with your pedal stroke - This product saves the equivalent of 15 PET plastic water bottles - A semi-fitted cut follows the curves of your body and leaves room for movement

Exploration unlocked. The Quantum Fitness Bike Short is purpose-built for fitness and exploration, with versatile features and a semi-fitted cut that can take you from the trail to everyday life with ease. Details: - An eco-conscious padded bike short packed with features for on- and off-road exploration. - Two-way stretch polyester outer-short is durable and comfortably moves with you - A wide waistband with bungee drawcord allows for quick fine-tuning of fit - A lightweight chamois wicks moisture and provides excellent breathability - Zippered side pocket offers secure storage - A vented leg opening moves with your pedal stroke - This product saves the equivalent of 17 PET plastic water bottles - A semi-fitted cut follows the curves of your body and leaves room for movement

An eco-conscious bike short made with technical fabrics and features that are ready for any trail. The Rhythm Mountain Bike Short is built for your biggest adventures, with technical fabrics that are durable enough to stand up to the world's toughest trails. Explore more with a durable woven polyester shell with comfortable two-way stretch, a dual-sided daisy chain waist adjustment, extra deep and pockets, and a zippered side pocket so you don't lose your keys...again.

Upgrade or refresh your bike. GENUINE REPLACEMENT PARTS When it's time to refresh your trusty bike, Trek Genuine Replacement Parts have you covered. PRODUCT DETAILS - Original equipment replacement Alex MD35 27.5 Boost 141 wheels - Alex MD35 rim is double wall, pinned and disc-specific - Does not include skewer, reflector, rim strip, valve, or owner's manual - Wheels shipped as photographed

An eco-conscious bike jersey that offers versatile performance with comfortable materials in a fitted cut. The best all-around jersey When you need one jersey that does it all, reach for the Circuit Cycling Jersey. It's built with lightweight and breathable fabrics, enhanced by 37.5 technology, which uses body heat to evaporate moisture and keep you cool, dry, and at the ideal core body temperature. Plus, it's packed with all of the other things that make a great cycling jersey, like three back pockets, full-length YKK zipper, and a raw edge sleeve for a seamless transition from jersey to skin. Made with love for you and the planet The Circuit Jersey is a bluesign product that's been STANDARD 100 tested by OEKO-TEX. 37.5 Technology Circuit uses 37.5 Technology to accelerate sweat evaporation and keep you cool, dry, and at the ideal core body temperature: 37.5° Celsius. Sleeves that stay Raw-cut sleeves with silicone-printed grippers provide a comfortable fit that stays put. Extended rear coverage A drop-tail design provides backside coverage and features silicone-printed grippers for added security. Essential storage Three open back pockets provide plenty of room to store your ride necessities. UV50+ Circuit fabrics are built to help you shine while reducing your exposure risk by offering UV50+ protection. Men's Trim Fit