Men's Base Layers

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...

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...

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

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...

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...

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...

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....

Perfect for giving it your all on the next pitch or pacing on your favorite trail, the Butter™ Long Sleeve Hoody is big on performance without sacr...

A classic, all-around 100% recycled polyester baselayer. The smooth, soft face makes for easy layering. Hollow-core yarns and a diamond-grid back t...

Whether your day calls for moving quick and light to set a new FKT or you just need a solid midlayer with the perfect mix of warmth, stretch, and b...

Meet the better-than-ever Men's Classic Thermal Merino Base Layer Crew. We've updated this 100% Merino wool fan favorite with new colors and a new ...

A midweight merino wool base layer top designed to help regulate temperature during high-intensity activity, the Merino 200 ZoneKnit™ Long Sleeve H...

The benchmark against which all others are judged, the 200 Oasis Long Sleeve Crewe Remarkables features our most versatile merino jersey fabric for...