New fin with interchangeable blade. The characteristics of the foot pocket incorporate comfort, technique, and efficiency. The volumes and additional thicknesses on the instep or the tensioners under the arch have been meticulously studied to convey maximum thrust from the product without sacrificing ideal comfort. The foot pocket is manufactured in a single material one of the lightest thus eliminating any problems in bonds between different materials and offering excellent mechanical properties. The significant side ribs perfectly support the blade-channeling the water flow, which in-turn prevents lateral slippage. The variable-thickness blade bends during the various phases of finning action, achieving the ideal flexion curve. The best technopolymers are used in this fin and increase its agility and resistance. The special design of the channels makes it possible to increase and channel the flow of water toward the end of the blade, thus increasing thrust and preventing slippage to the side. Its light weight and power give the Razor Pro the best yield among all the technopolymer fins currently available on the market.