Base Layer and Underwear

This RedHEAT ACTIVE base layer bottom lives up to its name with optimal body temperature regulation. The innovative technical fabric incorporates carbon microcrystals that store body heat while its microporous structure maintains breathability for maximum

This new RedHEAT EXTREME base layer bottom lives up to its name with optimal body temperature regulation. The innovative technical fabric stores and manages body heat through carbon microcrystals for maximum comfort in extreme conditions. Thanks to the Re

ACTIVE SPORT ankle-length base layer bottom. Elastic waistband. Men ACTIVE style.

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

Women’s lightweight Torrent™ zip neck base layer for lower output activities in cool temperatures.

Lightweight Torrent™ zip neck base layer for lower output activities in cool temperatures.

Our best-selling base layer bottoms made from soft and breathable 100% merino wool jersey, the 200 Oasis Leggings are the perfect foundation for your cold-weather layering.

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.

The targeted insulation and ventilation in the Men’s Merino 250 Base Layer Bottoms allow you to stay comfortable while you’re out working up a sweat.

This heavyweight base layer is made with Drytex® 4000, a technical fabric that is brushed on both sides to create a thick insulation layer of air that retains body heat, and Mesh, a fabric that provides incomparable comfort and flexibility as well as maxi