Kari Traa Svala L/S

“I was all over—packrafting in the Canyonlands, skinning up Fourteeners, hiking through Canada’s Yoho National Park—and this was the only baselayer I ever brought,” says our tester. Its versatility comes from an interwoven blend of polyester and wool fibers: The sparse hydrophilic wool fibers pull sweat off your skin, while the dense hydrophobic poly fibers push it to the surface where it can evaporate. The catch: There’s not enough wool for natural odor control, so it smelled pretty funky after a couple days of intense use. $70; 5.9 oz.; XS-XL; karitraa.com