The H2O Jogger is a belt that allows you to practice running while in the water. It's symmetrical design allows you to remain balanced vertically while floating in water. The H2O Jogger is made of EVA foam, so it will last a long time and won't absorb any water. A web nylon belt helps provide a secure fit. The H2O Jogger is available in two sizes: Small/Medium, which is 26" and is for users under 160 lbs, and Large/X-Large, which is 29" for users over 160 lbs. For more information on this and other water fitness products contact the pros at PoguePoolSpa.com!