Men's Base Layer Tops

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

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...

Technical. Comfortable. Reliable. That's what you get with our Men's Intraknit Merino Tech 1/4 Zip. This durable mid layer features our high-perfor...

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 Merino 200 Oasis Long Sleeve Crewe Cloud Dye features our most versatile merino wool jersey ...

A versatile, body-mapped zip-neck top that’s ideal for high-intensity adventures, the Merino 125 ZoneKnit™Long Sleeve Half Zip features our Cool-Li...

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

Tackle cold temperatures with our Men's Long Sleeve Colorblock Henley! Perfectly crafted from Merino/polyester blend, this top moves sweat away ...

An ultralight merino base layer top designed to help regulate body temperature during high-intensity activity, the 125 ZoneKnit™ Short Sleeve Crewe...

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

A breathable, lofted baselayer to keep you warm in cold conditions. Polartec® Power Grid® fabric with HeiQ® Pure odor control. Made in a Fair Trade...

This ultra-soft knit turtleneck top for men offers a stylish look, all while providing protection against the cold. Completely versatile, our turtl...

Midweight merino base layer bottoms designed to help regulate temperature during high-intensity activity, the 200 ZoneKnit™ Leggings feature 100% p...

Ultralight merino base layer bottoms designed to help regulate body temperature during high-intensity activity, the 125 ZoneKnit™ Leggings feature ...

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...

Our Men's Intraknit™ Thermal Merino Base Layer Crew is anything but ordinary. Super lightweight, ultra-moveable and designed to maximize thermor...

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

Experience superior fit and performance with Men's Intraknit™ Thermal Merino Base Layer Colorblock Crew! Crafted with our innovative Intraknit™ tec...

Our Men's Classic Thermal Merino Base Layer 1/4 Zip has an improved fit that takes functionality to the next level. Crafted with 100% responsibl...

Icebreaker's technical, cold-weather base layer top for highly aerobic days, the 260 Zone Long Sleeve Crewe features zoned ventilation panels for ...

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.

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