The AquaTrim's specially contoured design allows for proper flotation and positioning during water running or water aerobics. Made of durable non-abrasive EVA foam that will not chip, break, or absorb water. It is specially contoured to fit below rib cage and above hips while promoting maximum range of motion and breathing. The special design also provides lumbar support and vertical balance. The adjustable sizing allows you to properly fit the individual with the correct amount of buoyancy. The belts can be attached together to provide a greater amount of buoyancy. The fully adjustable nylon belt securely fastens the Aqua Trim in place around your waist. The belt float can also be used as a buoyancy aid for beginning swimmers or handicapped individuals that need some additional float support to fully utilize the benefits of aqua aerobics or just to have fun. The belt is made of a high density, closed cell EVA foam that will not absorb water or chip and is soft to the touch. Available in sizes s-l.