TuneBand for iPhone 4 / iPhone 4S, Premium Sports Armband with Two Straps and Two Screen Protectors, PURPLE COMPATIBILITY: Fits a bare iPhone 4/4S *only*. If you own a different device, then please search Amazon for the appropriate TuneBand. ACCESSIBILITY: Durable silicone skin allows access to all ports, buttons, and cameras. Enjoy unobstructed access to your music and apps! COMFORT: Two (2) soft, elastic Velcro straps accommodate arm circumferences between 7" - 18" (about 18cm to 46cm). See product description regarding longer and shorter straps. PROTECTION: Two (2) screen protectors cover front of iPhone 4/4S, and contain no adhesive. CONVENIENCE/CHARITY: Two-piece design means you can use the silicone skin as an everyday case, and then attach the elastic strap when exercising. Green and yellow versions support charities that are close to our hearts.