Nike Women's Dri-fit Contour Short Sleeve 100% Polyester Imported Machine Wash A Dri-FIT mesh panel in the middle back is knit from loose to tight with three different textures for varying degrees of cooling. Dri-FIT fabric helps you stay dry and comfortable by wicking away sweat to the fabric's surface, where it quickly evaporates. Ergonomic seams are rolled forward for comfort and the body-mapped design enhances your natural range of motion. Reflective elements stand out in low light. Reflective media-player cord at upper back.