The Best Base Layers, 2018: Merino Wool, Under Armour, More

We asked runners, cyclists, skiers, and hikers to recommend their favorite cold-weather base layers. Their picks include tech fabrics and merino wool from Icebreaker, Smartwool, Tracksmith, Nike, Under Armour, Craft, Mammut, and more.
Instead of padded cycling tights, which he says never seem to fit right, Walton prefers wearing leg warmers on colder days, saying that you want the most protection over the areas on your body that break the wind. When cycling, that means the knees, not the working muscles of the upper leg that are covered by a regular short. “Pearl Izumi is always good because they’re a staple in the cycling world,” he says, and these leg warmers let you wear your favorite cycling shorts while protecting the rest of your legs.
Blended with Lycra, this similar wool half-zip for women offers unlimited mobility without sacrificing warmth.

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