With their long, hydrodynamic blades, these fins add propulsion to flutter and butterfly kicks. Buoyancy from the fins lifts the legs to the surface, reducing drag from the rest of the body. The closed heel design provides protection against over-flexing the ankles and increases comfort. Made of soft, floatable rubber, the fins won't sink in either fresh or salt water, making them ideal for open water and pool training. Size: XXS(Jr 11-1 ). Color: Blue.