This is the perfect accessory for any fitness fanatic. This armband provides a tight fit for the iphone 4 and is made out of a waterproof material. There is a hole on the top for the speaker and a slit in the back to slide the iphone in and use a set of earphones. There is a slit in the side of the arm band to be able to put a key or some coins in. The armband wraps around the arm with a velcro strap.