Light and breathable: The elastic material has a waterproof film on the inside to prevent perspiration from penetrating. Keeps your items dry and secure when wet. You won't even notice you're wearing it. Safety and Visibility: The reflective tape on the waist bag's zipper guarantees your safety and visibility at night. This design makes you safer when you run at night. ADJUSTABLE AND COMFORTABLE: The elastic belt is universally adjustable, making the gym bag stay in place comfortably. No more jumping and sliding. Fits most waist sizes. Multi-pocket storage: This running belt has multiple independent pockets to store your items. The separate key pocket can separate your keys and phones to avoid scratching the phone screen or other valuables. Product Description Material: Neoprene