The ISHOF SaferSwimmerTM Float is specifically designed to provide a safety aide for open water swimmers, serving three important functions without hindering performance or hindering your stroke.    size: Medium dimensions: 60x26cm volume: 6 Liter dry compartment material: TPU/Nylon   The ISHOF SaferSwimmerFloat keeps you or your children safe during most swimming activities. It basically works as an inflatable float which is attached on a band to your waist and is carried in the current behind you. Now you might be thinking, well, that is not that revolutionary. You are right, this simply is not, however, the beauty comes in the fact that the device does not cause you to swim slower due to its resistance behind your body. When you swim, your body creates sort of a turbulent wave channel behind you with water moving in the direction of your swim. In more scientific fluid dynamics terms, this turbulent wave creates vortices which in turn produce a low pressure area behind the swimmer