The best thermal underwear is nothing short of essential when the mercury drops. Whether you’re a skier or simply looking to stay warm outside or at night, thermal underwear is your first layer of defense against the cold. Our top pick overall, Smartwool’s Classic Merino Long-Sleeve Top and Bottom, has the right weight and breathability that makes it versatile to wear on its own or as a base layer—essentially, this is a set you’ll get a lot of use out of. Other options work better in different situations, so we evaluated all the specs and came up with 9 picks that we highly recommend depending on your specific needs. The best thermal underwear keeps you warm, comfortable, and active in any condition.ILLUSTRATION: FORBES / PHOTO: RETAILERS At Forbes Vetted, we’re experts on thermal underwear, having tested countless pairs deep in the backcountry in Alaska, winter camping in Utah’s Wasatch, chasing powder in Japan and skiing in subzero temps in Jackson Hole. At the end of this guide, you’ll find more details on how we choose the best men’s thermal underwear as well as additional tips for layering and staying warm, no matter the conditions. Best Thermal Underwear Overall: Smartwool Smartwool Classic All-Season Merino Long-Sleeve Top and Thermal Merino Bottoms Best Sweat-Wicking Thermal Underwear: REI Midweight Long-Sleeve Base Layer Best Thermal Underwear For Extreme Cold: Icebreaker MerinoFine Polar Long Sleeve Half Zip Thermal Top Best Lightweight Thermal Underwear: Helly Hansen Lifa Stripe Long-Sleeve Crew Base Layer Best Affordable Thermal Underwear: Under… Click below to read the full story from Forbes
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