Craft Sportswear Men's Concept Piece Short Sleeve Base Layer Shirt: cooling/sport/bike/ski/run/sun/protection/top 95% Polyester, 5% Elastane Imported Concept that merges body mapping with sport-specific fit solutions Thin, lightweight, and elastic fabric that is channel -knitted with two high-tech polyester fibers. A hexa-channel fiber helps moisture transport Flatlock seams that follow body movements Bodymapped mesh superlight Moving Wind Technology for total freedom of movement