Thermal underwear goes by many names, from base layers to long underwear, and has more uses than we sometimes think. A good set of thermal underwear is essential for skiing, winter hikes, and camping, ...

As a lifelong skier, I’ve tried many—and I mean many—different kinds: merino wool, merino wool-blend, athletic compression styles, classic waffle-knit cotton, and more. Don’t make the mistake of ...

Best Long Underwear In 2025 For A WARM Base Layer In The Winter Links to the best Long Underwear are listed down below: ►8.