The Lightweight Poly 1/4-Zip Baselayer Top is designed for low-bulk warmth, moisture-wicking performance, and all-day comfort in cold temps. We used recycled polyester for breathable sweat management and some eco-friendly peace of mind, along with a touch of spandex for stretch where we need it. Details Quarter-zip baselayer for lightweight warmth on chilly resort days Stretchy blend wicks sweat, breathes well, and is eco-friendly Slim fit moves with you and keeps performance fibers close to skin Integrated thumbholes bolster protection against the cold Anti-odor treatment prevents funky odors from growing