Diateklity Waterproof Sports Phone Armband with Key Holder for iPhone- Good for Hiking, Biking & Running - with Reflective Strip for Safe Running Adjustable for Both Men and Women SCREEN PROTECTOR - Diateklity sports armband as well as any Phone that has a screen up to 4". With the protective screen cover on the armband with fully touch compatible, you can enjoy the full use of your iPhone without removing the phone. PREMIUM MATERIAL - With water resistant design, Diateklity sports armband protects your phone against water and sweat. Premium Neoprene keeps the armband firmly on your arm even with long use. ADJUSTABLE SIZE - Diateklity sports armband is adjustable and accommodates arm sizes from approx. 8 to 16 inches. REFLECTIVE STRIP - A reflective strip is designed for safe running in any low light condition. SECURE DESIGN - With a hidden key holder, you can take your house/car keys during sports and never worry about losing keys at the gym.