Nike Element Half-Zip Men's Running Top Long Sleeve Shirt The half-zip design adds custom comfort while ergonomic seams enhance range of motion. More Benefits Mock neck to help keep out the cold Spandex for better range of motion and a comfortable stretch fit Reflective loop at upper back to keep media-player cords out of the way Product Details Half-Zip pull over Mest insert underarm Reflective swoosh Fabric: Dri-FIT 88% polyester/12% spandex Machine wash