Under Armour Women's CoolSwitch Run Tank 80% Nylon/20% Elastane Imported Fitted: Next-to-skin without the squeeze UA CoolSwitch uses an exclusive coating on the inside that pulls heat away from your skin, making you actually feel cool & able to perform longer Signature Moisture Transport System wicks sweat to keep you dry & light UPF 30+ sun protection Classic crew neck , slight drop-tail hem with side vent