Men's Base Layers

Light, comfortable trim-fit base layer for mixed output in cool temperatures. The base layer crew – the foundation of your system. Made for mixed o...

Performance base layer for lower output activities in cool to cold temperatures. Comfort starts with your base layer. Made for performance during l...

An incredibly warm merino wool base layer for the coldest months of the year, the Merino 260 Tech Long Sleeve Half Zip is a go-to piece for winter ...

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

A base layer is your system's foundation. The men's Arc'teryx Rho LT Hoody delivers moisture transport, light warmth and next-to-skin comfort for l...

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

Our best-selling base layer bottoms made from soft and breathable 100% merino wool jersey, the 200 Oasis Leggings With Fly are the perfect foundati...

Midweight base layer bottoms perfect for skiing, winter hiking, or cold-weather layering, the 260 Tech Leggings With Fly are a warmer version of ou...

A heavyweight merino wool base layer top designed for the coldest of days, the 300 MerinoFine™ Polar Long Sleeve Half Zip features premium 15.5-mic...

We've updated the fit of our Men's Classic Thermal Merino Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics. As one of ou...

New to our innovative Intraknit™ line is the Men's Intraknit™ Thermal Merino Base Layer 1/4 Zip. This Smartwool® base layer is 3D-mapped for a near...

A breathable, lofted baselayer to keep you warm in cold conditions, built of Polartec® Power Grid® fabric with HeiQ® Pure odor control for freshnes...

A breathable, lofted baselayer to keep you warm in cold conditions, built of Polartec® Power Grid® fabric with HeiQ® Pure odor control for freshnes...

Made with our innovative Intraknit™ technology, the Men's Intraknit Thermal Merino Base Layer Colorblock Crew is designed with colorblock patternin...

Versatile year-round base layer bottoms made with 100% merino wool and a slim fit, the 175 Everyday Leggings With Fly offer premium breathabili...

Setting the standard for all others to follow, the Merino 200 Oasis Long Sleeve Half Zip features our most versatile merino wool jersey fabric ...

This 100% Merino wool slim-fit mid layer is ideal for technical mountain adventures like hiking, skiing and climbing. The Merino 260 Quantum Long S...

A midweight baselayer designed for intense activity and made with 100% merino wool fabric, the 200 ZoneKnit™ Long Sleeve Crewe features  ZoneKnit t...

The Merino 175 Everyday Long Sleeve Half Zip is a classic, all-purpose base layer made with soft and breathable 100% merino wool rib-knit fabric. ...

Performance base layer for lower output activities in cool to cold temperatures. The Rho LT is your lightweight thermal base layer for low and medi...

An alpine-inspired active slim pant that can be worn alone or as a base layer. From high alpine trails to the climbing gym, the Butter™ Slim Pant i...

Make every high effort outing smooth as butter with a long-sleeve layer that’s worth its weight in sunscreen—minus the need for reapplication. This...

This perfect moisture-wicking base layer is buttery soft, allowing you to move effortlessly through any environment without chafing or overheating....