Strauss Sports Mobile Arm Band, (Black) Fitness Arm Band - This arm band provides excellent protection during sports such as running, biking, jogging, walking, working out etc. Premium Quality - This fitness arm band is made of neoprene that's lightweight, washable and flexible at the same time so as to help you remove sweat Ergonomic Design - Built in Reflective strip for safe running in low light conditions, it has an inbuilt key holder and cutouts for easy access to headphones port and controls Waterproof and Adjustable - This is an adjustable and water proof Velcro arm band that could fit the arms of the circumference of about 11-15 inches Wide Compatibility - Mc Loj Hand Band Case is compatible for all smart phones till 4.7 inches. Wrap it round your wrist or your arm and slide in your device, where it will stay safe & secure.