Ultra lightweight performance sock. Supersoft tactel micro outer, soft tactel inner layer. Hi tech 2 layer fabric wicks perspiration away form the inner layer to the outer layer. Superfine mesh on top of the foot to help feet cool. Anti microbial. Hand linked flat toe seam to help prevent blisters. Anklet length has open mesh leg for airflow and cooling. Arch grip section and Y heel for optimum fit. Lycra for stretch and recovery. 96% tactel polyamide and 4% lycra.