This is the Mares Razor Matrix Spear Fishing Carbon Full Foot Fins Features: Blade Produced with pre-impregnated carben and fiberglass layers New 3K carbon with fibers woven at 90Adeg Fibers cross over each orther fewer times, increasing the responsiveness of the blade Variable blade thickness and high-performing parabolic flexion The blace is 20.5cm wide and 65cm long High-quality manufacturing process New variable side ribs support and optimize channel thrust and flex Available with a soft or medium strength blace 22Adeg blade inclination relative to the foot pocket The razor foot pocket is designed to be worn with a 3mm neoprene sock Fin protection bag included The Razor Matrix is an incredible fin made of a combination of woven carbon and fiberglass layers. This high-quality fin offers great performance and responsiveness. Blade produced with pre-impregnated carbon and fiberglass layers. The Razor foot pocket is designed to be worn with a 3 mm neoprene sock.