Quad Lock Sports Armband The Most Comfortable & Convenient Smartphone Sports Armband. Low contact with skin reduces sweat. Patented dual-stage locking mechanism ensures your phone stays securely on your arm Ideal for tracking your fitness via apps like Strava, easy access to music, and never missing a phone call or text message again Fully adjustable nylon lycra armband will fit any arm size with circumference 17-38cm or 6.5-15 inches Compatible with all Quad Lock Cases & Adaptors Nylon / Lyrca Strap Low contact with skin reduces sweat Hand-washable material Adjustable to fit arm circumference 17-38cm or 6.5&#034;-15&#034; Compatible with all Quad Lock Cases &amp; Universal Adapters