Our armbands are made of soft neoprene, bent, bent, bent but not stretched. Tribal arm is the speed and comfort of all the activities of the ultra-light weight. Adjustable arm band for arm circumference: 10 - 15 inches, allowing you to adjust the arm with maximum comfort. Adjustable Velcro protection and stabilization equipment that will not slip or shrink. Our arm provides full screen coverage, but you will keep the full screen function, with your headphone jack to support your phone. Easy to move and washable. Built-in reflective strip, safe operation in low light conditions. Anti-sweat layer prevents sweat and moisture from entering any incision. Built-in hidden key ring, perfect house / car keys! Do not worry about your keys in your pocket or lose them in the gym.