Yiyigate Iphone 4 4s Sports Gym Running Cycling Jogging Armband Case Cover Strap - Blue Made from light-weight, sweat resistant and stretchable neoprene provides optimum comfort. Access to all your apps and control your music without having to stop to take the phone out of the armband. Secure adjustable armband - one size fits all. Provide excellent protection during sport, such as running, biking, jogging, walking, working out etc.