Men's Baselayer and Underwear

First on, last off'Essential Boxer Briefs are our go-to do-all's. Light on the skin and endlessly breathable, they provide all-day comfort with a f...

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 ...

We've updated the fit of our Men's Classic Thermal Merino Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics. As one of ou...

Over forty years ago Terramar was the first company to introduce pure silk performance base layer products. Today, Thermasilk is still the standard...

New this season, we're printing a pattern on our Men's Merino 150 Print Boxer Briefs- bringing you the ultimate in Merino comfort with a fun, mount...

Our Men's Merino Print Boxer Briefs bring you ultimate Merino wool comfort with a fun, outdoor-inspired design. Our Core Spun technology increases ...

The Echo Boxer Briefs are a performance base layer, providing breathable and ultralight support with ActiveFresh anti-odor technology, perfect for ...

We make these everyday boxers for every type of day'because sometimes you're desperately running through O'Hare and other times you're putting your...

The Sierra’s superb Evolution traverse combines a chilled, pre-dawn start, high-altitude temperatures and sometimes-frigid shade with a non-stop, a...