GearX Men's Deep Sleeveless Baselayer For Summer 91% Functional Nylon / 9% Polyurethane 91% Functional Nylon / 9% Polyurethane Cold water wash / No bleach / No fabric softener / Hang Dry Icemade / Cools down your body temperature Antimicrobial technology that reduces odor UV Block / Ultra-Violet ray-Shielding Function