We flattened out the fibers and added some science to create a game-changing fabric that quickly pulls heat away from the skin-keeping you calm, cool, and crushing at max capacity. Iso-Chill fabric helps disperse body heat, making it feel cool to the touch 4-way stretch material moves better in every direction Material wicks sweat & dries really fast UPF 50+ protects your skin from the sun's harmful rays Low-profile, micro collar Style #: 1373692 88% Nylon/12% Elastane Imported Loose:Fuller cut for complete comfort. Machine wash cold with like colors Use only non-chlorine bleach when needed Tumble dry low Do not iron Do not use softeners Do not dry clean