Adjustable Range: Supports Any Arm Girth From 8.5 Inchto 15 Inchto Protect & Stabilize the Device From Slipping or Contracting in Your Indoor or Outdoor Activities. Running Phone, Arm Band, No Worries. Updated Version of High Quality Material Mobile Bag: the Fitness Arm Band & Exercise Belt Are Made of Skin Friendly, Breathable Mesh & Elastic Neoprene Fabric with a Blend of Waterproof, Sweat Resistant & Washable Features to Provide a Soft, Odor Free & Lightweight Wear Experience. Minimum Quantity: 100