1、The convex design of the sole increases frictions and prevents slipping. 2、Strong flexibility, not easily broken or deformed. 3、Strong and powerful, swimming accelerates. These flippers are designed to provides increased propulsion and nice control in the water, making them perfect for both recreational swimmers and professional athletes. Features: The convex design of the sole increases frictions and prevents slipping. Strong flexibility, not easily broken or deformed. Strong and powerful, swimming accelerates. Streamline diversion design. Made of fine quality material for long service time. Specifications: Color: black Size: S, M, L, XL, XXL (optional) Material: TPR+polypropylene Suitable foot size: S: 36-37 M: 38-39 L: 40-41 XL: 42-43 XXL: 44-45 Total length: S: 470mm M: 480mm L: 490mm XL: 500mm XXL: 510mm Width: S: 160mm M: 165mm L: 170mm XL: 175mm XXL: 180mm WebLength: S: 270mm M: 275mm L: 280mm XL: 285mm XXL: 290mm Package size: 600 * 220 * 110mm / 23.6 * 8.7 * 4.3in Package weight: 800g / 1.8lb Packing List: 1 * Pair of Flippers Packing List: 1 * Pair of Flippers