Nike Women's Dri-fit Contour Long Sleeve 100% Polyester Imported Machine Wash Tumble Dry Dri-FIT mesh fabric wicks away sweat to help keep you dry and comfortable Reflective loop at upper back to keep media-player cords out of the way Ergonomic seams are rolled forward for comfort and the body-mapped design enhances your natural range of motion Dri-FIT mesh panel in the middle back is knit from loose to tight with three different textures for varying degrees of cooling Reflective details for enhanced visibility in low light conditions