These base layers prevent sweat buildup and protect against the cold, whether you’re working outside or hitting the slopes.

Our product picks are editor-tested, expert-approved. We may earn a commission through links on our site. Why Trust Us? LET'S BE FRANK: Thermal underwear is arguably the least sexy type of ...

If you ask us, there's nothing better than a pair of thermal underwear that moves when you move. The REI Co-op Midweight base layer bottoms are ideal for our active guys who are constantly ...