Designed specifically for iPhone 6 /iPhone 6s /iPhone 7 and other smartphone within 4.7 inch.Lightweight armband keeps your phone secure and protected. Made of high quality lightweight neoprene material with clear protective plastic membrane for the screen. Armband with adjustable velcro strip. It is easily removable and washable.Provide excellent protection during sports, such as running,cycling,jogging, walking,work out etc. Built in Reflective strip for safe running in low light conditions. Built-in Key holder. Cutouts for easy access to headphones port and controls. Water Resistant and sweat-proof function to better protect your phone, make you feel more comfortable during exercise Adjustable hook and loop band supports a wide range of arm girth from 10.8" (27.5cm) to 16.5" (42cm) and stabilizes device without slipping or constricting.