Men's Base Layer Tops

Torrent™ 190 with Polygiene® manages moisture, provides light warmth and performance stretch, is brushed for softness. Polygiene® treatment provide...

Lightweight, fitted base layer top in comfortable, high-performance Torrent™ fabric. Made for mixed-output activities in cool temperatures. Torrent...

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...

Technical, cold-weather base layer bottoms for highly aerobic days, the 260 Zone Leggings feature zoned ventilation panels for active temperature r...

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...

Experience the revolutionary Intraknit™ line with the Men's Intraknit™ Thermal Merino Base Layer 1/4 Zip. This Smartwool® base layer is designed...

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

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...

Discover the award-winning Men's Classic Thermal Merino Base Layer Crew. This 100% Merino wool favorite has been reinvented with dazzling new co...

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...

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...

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...