This was the go-to belt for Hawaii Ironman champ, Chris McCormack when he won the race back in 2007. It's a race-inspired belt that holds two 7oz bottles which sit behind your back. This is the ideal belt for shorter training runs or events like the 5k, 10k or half marathon distance. Reflective, neoprene pocket. It comes in sizes S-XL with measurements as follows: S (27"-29"), M (30"-32"), L (33"-35"), XL (36"-38"). For other ways to stay energized during an important run or workout, check out our range of sports nutritional products, including protein powders, Sport Beans, and electrolyte drinks!