Under Armour Women's HeatGear CoolSwitch Short Sleeve 92% Polyester/8% Elastane Imported 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 Super-light HeatGear fabric delivers superior coverage without weighing you down Signature Moisture Transport System wicks sweat to keep you dry & light Cutout back Slight V-neck with slight drop-tail hem