Single-layer engineering. CPT powered by SILVADUR??? technology. Wicks and aids in moisture evaporation. Extended body and sleeves for ultimate athletic fit. Crew has a rounded, hemmed bottom. Sleeves have built in thumbholes. Pant is a yoga style legging with an athletic rise designed for exceptional comfort. 88% CPT performance polyester fleece, 12% spandex. For cold/extreme cold weather, low/high activity level. Weight: 7 oz.