The Quad Lock Sports Armband is the easiest and most secure way to take your smartphone on your next run. The patented dual-stage lock keeps your phone slightly raised from the armband, so there is no friction between your arm and the smartphone. Features a simple twist and lock system that makes it easy to attach or detach your smartphone whenever needed. Nylon/Lycra strap. Hand-washable material. Adjustable to fit any arm size between 6.5"-15" (17-38cm). Compatible with all Quad Lock cases and Universal Adaptors.