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La Sportiva continues to expand its apparel line with breathable baselayers built for long haul trips. But the enhanced functionality doesn’t mean they can’t be cozy, too: the Stratosphere long-sleeve uses EKS/Merino wool for a next-to-skin feeling. $119
Get a comfy, casual look paired with technical performance with Craft’s latest layers, made of fast-drying polyester with bodymapped mesh sections in the body’s hottest zones. The torso is seamless to prevent chafing. MSRP $60
Columbia continues its line of disco-ball baselayers with the Trail Summit, lined with the company’s Omni-Heat technology. The idea is that the shiny interior reflects your body heat back on you, keeping you warm with less bulk. MSRP $60
A onesie, you say? Absolutely: This full-coverage union suit is made of Airblaster’s Woolverino, a blend of merino wool, Lycra, and Tencel, a cellulose-based fiber. Airblaster says the fabric dries twice as fast as wool alone, plus is stronger and softer. MSRP: $200
This year, Eider debuts two baselayers made of a new premium fabric from Polartec called Power Wool. The material places merino wool on the inside of the garment for its moisture-loving and odor-fighting properties and hydrophobic synthetic fibers on the outside for faster drying. They’re pricey, but oh-so-worth-it. $200 (1/2-Zip); $180 (Pull)