NIKE Women's Racer Dri-FIT Solid Half-Zip Running Top Size Medium 100% Polyester Machine Washable The Nike Racer 1/2 Zip Women's Long Sleeve Running Shirt features lightweight fabric that pulls sweat away from the skin keeping you cool, dry and comfortable on those early morning runs. Dri-FIT fabric to wick sweat away and help keep you dry and comfortable. Longer back hem for a fit that stays in place. Ergonomic flat-seams for minimized chafing and enhanced range of motion. Fabric: 100% Polyester