The latest addition to Cressi's wide range of world-renowned fins is the Frog Plus Open Heel Diving Fins. The Frog Plus offers many of the great features of a traditional paddle blade, along with a revolutionary new blade material that is both extremely durable and nearly indestructible. Frog Plus uses Cressi's proprietary three-material injection molding process. The three materials consist of a nice, comfortable rubber on the foot pocket that runs along the side rails of the blade. The second material is the revolutionary new dual density technopolymer that forms the blade and together with the third silicone base material creates a channel effect. The channeling effect is a property of the flipper that allows high levels of energy to be transferred in both up and down strokes. The Frog Plus also includes Cressi's patented foot pocket placement under the blade. This design increases the working surface area of the blade by 20%. The combination of the channeling effect and the foot pocket installed under the blade creates a very strong and efficient fin with minimal leg strain. These features make the Frog Plus fin an ideal choice for entry-level divers.