Under Armour Women's Fly Fast 1/2 Zip 88% Polyester, 12% Elastane Imported Smooth, super-soft fabric delivers a fast feel & incredible next-to-skin comfort Brushed interior circulates heat for optimal temperature regulation Signature Moisture Transport System wicks sweat to keep you dry & light Generous  zip front with stand collar for extra coverage Updated thumbholes keep sleeves secure & help seal in body heat