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Whether it’s for the warm or cold season, or somewhere in between, a quality base top will help keep you warm, without holding in sweat, so you can stay dry and comfortable, no matter how you like to pace your adventures. Our team has been buying and testing dozens of the best base layers for men on the market for over a decade.
We compare the most popular options side-by-side, scoring them across key performance areas, like warmth, breathability, and drying speed, to hone in on the best thermal tops for your winter and outdoor adventure needs. From the ski slopes to alpine climbs to sleeping out under the stars, our in-depth analysis derives from real-world use testing undertaken while wearing each model.
Our top choice overall is the Smartwool Classic Thermal Merino 1/4 Zip. It’s 100% Merino wool, super soft and warm, and has a front zip to help release or retain heat as needed.
If you want wool but need something more affordable, check out the crew-necked Meriwool Merino 250 Long Sleeve, which is around half the price of our favorite Smartwool pick.
If a warm synthetic is what you seek, check out the REI Co-op Midweight Half-Zip. It’s comfortable and breathable, features thumb holes, and costs less than most wool options.
Editor’s Note: We updated our men’s base layer article on April 1, 2026, to include fresh new picks from Mountain Hardwear, Ibex, and Burgeon.
