Multifunction Armband Fits Small & Larger Arms & No Slip: Adjustable arm band velcro large range with two fastening sizes supports any arm girth from 8” to 16” to protect and stabilize the device without slipping or constricting during your indoor or outdoor activities Made of PU Leather waterproof material, this armband easily bends, flexes, twists or folds without warping. Adjustable strap protects and stabilizes device without slipping or constricting. The back of the sports armband is breathable which allows air to pass which reduces the heat on the arm. For a relaxed fit there is cushion on both sides of the arm.