GearX Women's Long-Sleeve Mock-Neck Baselayer For Summer 91% Functional Nylon / 9% Polyurethane Cold water wash / No Bleach / No fabric softener / Hang Dry Cold Function / Cooling down body temperature : It could feel cool on wearing it and it's made of Nano Aqua-Chem Processing for taking away the heat. Quick dryness / Heat Dissipation : It absorbs sweat quickly and to make lower body temperature by evaporating, and to release heat away from the skin. UV Block / Ultra-Violet ray-Shielding Function : It protects your skin from UV-A/UV-B radiation during your outdoor workout. Antimicrobial technology that reduces odor : Anti-odor technology prevents the growth of odor-causing microbes.