Easily and firmly attach your race number with secure fitting for up to six gel packets through the side straps. DURABLE MATERIAL: Made of Polyester and Natural Latex Rubber, with strong elasticity and flexibility. PROTECT YOUR GEAR, NO MORE PINS: Remove worries about pins ruining your racing gear. ENERGY SUPPLY: Three elastic gel holders on each side allow for fuss-free refueling on the run. EASY ON & OFF: Feature a quick release buckle at the front. No-snag rotation to show your race number either at the front or the back.