Soft, stretchy, breathable and compressible, Capilene Thermal Weight is made of Polartec Power Grid fabric with a smooth face that glides beneath layers and a brushed-fleece interior to warm your core, wick moisture and feel smooth against your skin. It also has between 30 - 92% recycled content and HeiQ Fresh durable odor control to keep you welcome among friends. HeiQ Fresh durable odor control means less washing and longer wearing, and because this zip-neck top is Fair Trade Certified sewn, the people who made it earned a premium for their labor. Product features include a self-fabric backing on the collar that provides added comfort and a locker loop that lets you hang it to dry, a long center-front zipper for venting, full underarm gussets for unhindered shoulder mobility, elastic thumb loops to help cover your hands, flatlock seams that minimize chafing, offset shoulder and side seams that lie smoothly beneath pack straps, and a drop tail for additional coverage.