The VELOC is a streamlined fit, flexible Thermoplastic Rubber foot pocket. 20 degree angle. Lightweight and comfortable. Designed to fit most current freediving blades on the market, including Riffe's composite and carbon fiber DiveR fin blades. Sold as a set of two foot pockets. Includes fin assembly kit needed for installation. Sizes:Mens 36/37 (2-3) 38/39 (4-5) 40/41 (6-7) 42/43 (8-9) 44/45 (10-11) 46/47 (12-13)