This is the Mares Razor Matrix Spear Fishing Carbon Full Foot Fins Features: Blade Produced with pre-impregnated carben and fiberglass layers New 3K carben with fibers woven at 90° 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 22° 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.