Men's Base Layer Tops

The base layer crew – the foundation of your system. Made for mixed output activities on cool and cold days, the Rho LT adds warmth, is made with w...

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

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...

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...

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...

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...

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...

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

A heavyweight merino wool base layer for highly aerobic days in cold weather, the 260 Zone Long Sleeve Half Zip features zoned ventilation panels f...