Best Thermal Underwear Pieces of 2019

The colder months can be pretty darn brutal, but sometimes staying bundled up next to the fire isn’t an option. Whether you’re working outside, going for a jog, or exploring snow country, thermal underwear is a must for cold-weather adventures, as it’ll keep you warm and wick away moisture. Mix and match these top picks to stay toasty on your next outdoor excursion.


SmartWool Men’s Merino 250 Baselayer 1/4 Zip

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Who said thermal underwear had to be basic? Step up your first-layer game with this merino-wool top. It’s super soft on your skin, helps regulate your body temperature, and has a subtle pattern with a quarter-length zipper to differentiate it from the rest.
Wear it as your only layer on cool-weather jogs, or bundle up under your ski coat and head out for some backcountry laps!




Helly Hansen Women’s Lifa Merino Seamless 1/2-Zip Top

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This is a great technical base layer from Helly Hansen, with its classic fit and seamless construction for an itch-free feel and maximum freedom of movement. Try your hardest to cover it in sweat, but it’s made of merino wool and equipped with Lifa Stay Dry technology, so it breathes and wicks moisture like a pro.




Icebreaker Merino Men’s Everyday Leggings

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Looking for a performance pair of leggings for the winter? This midweight option is Icebreaker’s most comfortable pair of merino-wool leggings. The construction allows freedom of movement and minimal chafing thanks to the gusset and flat-lock seams.
We love these leggings under shell pants for snowshoeing, backcountry skiing, or just shoveling snow and chopping wood.



Carhartt Men’s Base Force Cold Weather Bottom

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For guys who work in the cold and have labor-intensive jobs, this long underwear is super warm and wicks away moisture. It’s also treated with antimicrobial technology that keeps odors from building up, so you won’t violate the workplace hygiene policy if you wear these two days in a row.




Tasc Performance Men’s Hybrid Fitted Long Sleeve Top

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Ideal for cold-weather runs or chilling on the slopes, this base layer has a longer length that’ll stay tucked in when you’re moving quickly. That, along with handy thumbholes, makes this the perfect first layer for playing outside in the cold.





Columbia Women’s Midweight Stretch Long Sleeve Top

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This four-way-stretch top has flat-lock seams that feel nonexistent next to your skin. It also features Columbia’s Omni-Heat thermal technology that reflects your body heat back onto you, helping you keep warm when temperatures drop below freezing.