Nike Men's Dri-FIT UV Miler Short-sleeve Running Shirt, Volt, Medium 100% polyester Imported Dri-FIT UV fabric to help keep you dry and comfortable while helping to protect against UV rays Rib crew neck with interior taping for comfort and durability Allover mesh for excellent breathability Ergonomic flat-seam construction for minimized chafing and enhanced range of motion Fabric: Dri-FIT UV 100% polyester