Underwear

We've updated our Men's Merino 250 Base Layers Bottom to bring you a better fitting, more functional tight. The technical benefits of 100% Merino wool will help you keep your game at a high level for longer. And Smartwool's warmest-weight wool fabric will help keep you warm and comfortable as you ski, run, and hike the day away.

The Men's Intraknit™ Thermal Merino Base Layer 3/4 Bottom are the warm and winter-ready pants you need to perform all season. Smartwool's Merino Sport yarn combines the power of ZQ-certified Merino wool with the strength and fast dry times of polyester . Featuring seamlessly knit mesh ventilation designed to keep you dry and comfortable and a 3D-mapped design for maximum mobility and durability, these are the men's wool bottoms every adventurer needs in their wardrobe.

Warm is an understatement. The Men's Intraknit Thermal Max Merino Base Layer Bottom uses 100% ZQ-certified Merino wool to help keep you comfortable on every cold-weather outing. Insulating terry loops are seamlessly paired with mesh ventilation to balance warmth and breathability, while knit-in reflective elements enhance visibility in low-light conditions. These are the men's base layer pants that every wardobe needs.

The Men's Intraknit™ Thermal Merino Base Layer 3/4 Bottom are the warm and winter-ready pants you need to perform all season. The Merino Sport yarn combines the power of ZQ-certified Merino wool with the strength and fast dry times of polyester . Featuring seamlessly knit mesh ventilation designed to keep you dry and comfortable and a 3D-mapped design for maximum mobility and durability, these are the men's wool bottoms every adventurer needs in their wardrobe.

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.

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.

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.

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.