This is the Mares Razor Apnea Spear Fishing Fiber Glass Full Foot Fin Features: Blade produced with pre-impregnated fiberglass layers Blade with variable thickness and high performance parabolic bending The blade has a width of 20.5cm and a length of 65cm High quality manufacturing process The new side profiles with variable height support and optimize flexibility and Channel Thrust effect Available with soft or medium stiff white blade Blade inclination at 22Adeg from the foot pocket Designed to be worn with a soft 3mm diving sock Protective bag for fins included The Razor freediving fins have a blade made of pre-impregnated fiberglass layers . The blade has a variable thickness and parabolic bending, capable of improving the effect the kicking motion with the least possible effort. Side profiles optimizing the Channel Thrust effect. Available with soft or medium stiff blade.