Men's Baselayers

Meet the better-than-ever Men's Merino 250 Base Layer Crew.

Smartwool has updated the Men's Merino 250 Base Layer Bottom to bring you a better fitting, more functional tight.

Performance first layer for trail runs and fast-paced pursuits in cooler weather.

Smartwool has updated the fit of the Men's Merino 250 Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics.

This minimalist-style crew is anything but insignificant.

The cutting-edge Intraknit™ Merino 200 Bottoms are here to help you warm up to cold weather.

Spring skiing or summer camping? The year-round Merino 150 Base Layer Long Sleeve is game for either.

Performance first layer bottom for trail runs and fast-paced pursuits in cooler weather.

A year-round favorite, our Merino 150 Base Layer Bottoms work hard to keep you comfortable everywhere, from the ski lifts to the campsite.

A classic, go-anywhere all-around baselayer, made with 100% recycled content. The smooth, soft face makes for easy layering; hollow-core yarns and a diamond-grid back trap warm air, wick moisture and dry fast. HeiQ® Fresh durable odor control keeps things

Constructed with the outdoor enthusiast in mind, this men's ¼ zip pullover is made of a Merino wool and recycled polyester blend that offers odor control, temperature regulation, and durability.

Perfect for brisk walks, cold hikes, or enjoying the comfort of working from home, theBest-selling and buttery-soft, the Baritone Collection is ultra comfortable when you're lounging, and beefed up with ActiveTemp™ when you're moving. Its soft, brushed in

Days when the air is crisp and the frost might bite, but Mother Nature continues to call. Designed using a recycled polyester and merino wool blend, this mid-weight thermoregulating base layer lives and breathe for the great outdoors.

The most versatile polyester baselayer with the greatest comfort range and Polygiene® permanent odor control.

The Men's Merino 250 Base Layer Colorblock Crew features 100% responsibly sourced Merino wool made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance.

Performance first layer for trail runs and fast-paced pursuits in cooler weather.

New to the innovative Intraknit™ line is the Men's Intraknit™ Merino 200 1/4 Zip.

Smartwool's new Men's Merino 250 Base Layer Pattern 1/4 Zip has been rebuilt to provide you with a more functional and fashionable garment.

Smartwool has combined the breathability, odor control, and comfort of responsibly sourced Merino wool with the durability and quick-dry characteristics of polyester for a base layer top that can handle all of your active, cold-weather pursuits.

Days when the air is crisp and the frost might bite, but Mother Nature continues to call. Embrace the outdoors while keeping your body toasty in this super-soft, midweight baselayer 1/2 zip top.