Ultimate Fitness Outdoor Craftsmen Running Waist Pack for Both Men and Women, Lycra Fabric Elastic & Waterproof Waist Bag, Waist Belt with Waterproof Zipper, 3M Reflex Strap Tape, Blue PRODUCT DIMENSIONS: Expand to approx 11*4 inches (pocket) 25-47 inches (elastic & adjustable waistband). Lycra fabric, waterproof & elastic & ultra light & anti-scratch. Waterproof zipper provides your items better protection. Buckle of high quality, quite durable & easy to put on. 3M reflex strap tape material, improve the safety of night running. Large capacity for cell phone, wallet, room keys and other essentials during outdoor activities.