NIKE Women's Pro Hyperwarm Half-Zip 8 Bit Training Shirt 685681 Imported Dri-FIT 88% polyester, 12% spandex brushed interior on sleek, moisture-wicking Dri-FIT fabric Underarm gussets allow for a wide range of motion thumbholes in the sleeves 1/2-zip design lets you control the flow of air for venting.