This sport fanny pack is made of nylon, slim, lightweight and soft. Features a master zipper bag, two layers inside the bag, you can keep you belongings separately. At the top of the right corner is a headphone hole. The belt is adjustable and flexible, the back of the pack is soft. It can fit with the waist size from 23" to 50". 12 3/5 L x 4 7/10" H