Single-layer engineering, CPT powered by SILVADURô technology. Trim fit for higher activity levels. Wicks and aids in moisture evaporation. Controls odor and inhibits bacterial growth on fabric. Extra length in body & sleeves for ultimate athletic fit. For cold/very cold weather, medium/high activity level. 85% CPT performance polyester, 15% spandex. Weight: 4.9 oz.