Nathan Sports Running Gel Pak, Black: * Limited-stretch elasticized belt with Featherweight buckle * Incorporated, waterproof I.D./medical emergency card * Lightweight, breathable wall mesh back panel and waistbelt * Internal valuables pocket with key clip * Dimensional zippered pocket * External power stretch mesh trash pocket * Reflective belt keepers * Adjustable belt * Material: plastic, mesh, nylon, polyester