Underwear

A classic, all-purpose base layer T-shirt made with soft and breathable 100% merino wool fabric, the 175 Everyday Short Sleeve Crewe is as versatile as it is comfortable.

Versatile year-round base layer bottoms made with 100% merino wool and a slim fit, the 175 Everyday Leggings With Fly offer premium breathability, odor-resistance and next-to-skin comfort.

The versatile, go-anywhere shirt made from breathable 100% merino wool jersey, the 200 Oasis Long Sleeve Crewe is Icebreaker's best-selling base layer top.

A versatile 100% merino wool base layer top with a classic zip-neck design, the 200 Oasis Long Sleeve Half Zip combines casual comfort with technical performance.

A versatile, go-anywhere shirt made from breathable 100% merino wool jersey, the 200 Oasis Short Sleeve Crewe is Icebreaker's best-selling base layer top. Fibers that regulates the body temperature in all weather conditions, along with resisting odors; gusseted underarms for mobility and comfort

The benchmark against which all others are judged, the 200 Oasis Shorts feature the most versatile merino jersey fabric for year-round layering performance across any activity.

Icebreaker's best-selling active baselayer bottoms made with their ultra-comfortable 100% merino jersey fabric and an updated design for improved comfort, the 200 Oasis Leggings w/ Fly are the perfect foundation for your everyday cold-weather layering system. The Oasis fabric is not only insulating and highly breathable, but it resists odors during extended use. The slim fit and gusseted construction provide unrestricted freedom of movement, while the brushed elastic waistband and flatlock seams throughout eliminate chafing when you’re on the move.

Introducing ZoneKnit Insulated Leggings: the ultimate combination of cozy comfort and versatile style. With advanced technology, these leggings provide targeted warmth to key areas, ensuring you stay snug in colder climates. Made from premium materials, they offer exceptional softness and flexibility for all-day wear. Dress them up or down for any occasion and embrace winter with confidence. Upgrade your wardrobe with ZoneKnit Insulated Leggings for the perfect blend of warmth and fashion.

A midweight merino base layer top designed to help regulate temperature during high-intensity activity, the 200 ZoneKnit™ Long Sleeve Crewe features 100% pure and natural merino wool.

A warmer midweight version of Icebreaker's best-selling Oasis Leggings, perfect for frigid days on the trails or the mountain, the updated 260 Tech Leggings w/ Fly feature a 100% merino wool fabric for premium softness, insulation and breathability. These odor-resistant baselayer bottoms also feature a gusseted construction for ample range of motion, and the brushed elastic waistband and flatlock stitching throughout eliminate chafing when you’re on the move.

A warmer, midweight version of the best-selling Oasis, the 260 Tech Long Sleeve Crewe is a go-to piece for winter layering, made with 100% merino wool.

Heavyweight merino base layer bottoms designed to help regulate temperature during high-intensity activity, the 260 ZoneKnit™ Leggings feature 100% pure and natural merino wool.

Classic boxer briefs made with a stretchy slim fit and their corespun fabric, the Anatomica Boxers are supportive and comfortable for daily life and active pursuits.

Classic boxer briefs made with a stretchy slim fit and Icebreaker's corespun fabric, the Anatomica Boxers with Fly are supportive and comfortable for daily life and active pursuits.

The pro cyclists we work with know the importance of the right base layer for the conditions. The Pro Mesh is made for the widest range of conditions and is designed to keep you dry in cool to mild temperatures. We’ll even put it under a Flanders Warm base layer in the coldest conditions. We’ve given it a graphic print so you can show off that you have something special when you open your jersey zip.

A hyperlight short-sleeve base layer, body-mapped with two types of open mesh for maximum airflow and moisture transfer during indoor training and the hottest racing conditions. The SUPERLÉGER was developed primarily for two specific applications. The first addresses the demands of speed-focused riders who train and race indoors, where the upper body layer needs be as light, breathable, and moisture wicking as possible. The second application is for the hottest outdoor racing conditions, where the same considerations also apply, but where a less revealing front mesh panel adds a touch of welcomed coverage while fully unzipped.

An exceptionally light base layer that manages moisture and controls odor beneath second-skin cold-weather layers or as a standalone top during indoor training. Thermal, weatherproof equipment is no longer the bulky PVC rain capes and adapted ski jackets of decades past, so—at the request of Assos' WorldTour riders—they tailored a long-sleeve base layer to provide summer-worthy wicking and odor control that fits unobtrusively beneath race-tuned equipment like our Spring Fall Jersey or Jacket. In cool or cold weather, transporting internal moisture is as important as keeping the external elements out, especially during intense training or racing, when a series of intervals, hill repeats, or attacks can lead to lingering moisture, a clammy chill, and frigid misery. Alternatively, full-arm wicking is a must for indoor training, when moving through the air isn’t constantly keeping your arms dry.

The Rho Heavyweight – Arcteryx's warmest base layer pants – is made for cold days and mixed output. On the move, the Polartec® Power Stretch® Pro stretches for outstanding freedom of movement. During rest phases – or when it gets really cold – the fleece’s soft brushed interior traps heat to keep you warm. The fleece’s durable nylon outer has a smooth face for comfort under layers, and a zippered thigh pocket secures small essentials. The Rho Heavyweight Bottom was previously the Rho AR Bottom.

The Rho Heavyweights – Arc'Teryx's warmest base layer tops – are made for cold days and mixed output. On the move, the Polartec® Power Stretch® Pro stretches for outstanding freedom of movement. During rest phases – or when it gets really cold – the fleece’s soft brushed interior traps heat to keep you warm. The fleece’s durable nylon outer has a smooth face for comfort under layers, the tall collar extends warmth, and the deep front zipper aids heat dump and makes on-and-off easier. The Rho Heavyweight Zip Neck was previously the Rho AR Zip Neck.

A slim, padded bike boxer brief, designed to cushion under casual clothes or baggies for quick comfort wherever the day takes you. A front cut-away keeps things cool by relieving heat build-up around sensitive areas. This is the new go-to hidden layer suited to getting to work, bikepacking trips, and any ride that ends at a brewery. Stay loose. Stay cool. This is the foundation we build on.