Foam Swim Aquatic Cuffs are perfect for body stabilization, flexibility improving, balance keeping and upper-body training in water. They are awesome for working your back, shoulders, arms and chest, helping you get stronger and get in better shape. Foam Swim Aquatic Cuffs are extremely buoyant, which makes it challenging to keep them submerged, providing an added dimension of resistance.. Can be used to suspend ankles, legs, wrists and arms during aquatic therapy.