Our Jet Fins are manufactured from a very high-quality rubber, using the latest manufacturing processes. They are very weighty and robust - specifically designed for maximum endurance, exceptional propulsion, and the ultimate finning power. Available with non-magnetic buckle styles. Tested in extreme commercial diving conditions. Preferred choice of divers around the world. Robust and superb endurance. Exceptional finning power. L, XL, XXL, XXXL.