The Avanti Excel diving fins have a closed, anatomical foot pocket. The whale tail design allows the power of the fin to be transmitted optimally. Made of three materials.Soft longitudinal inserts enable controlled deformation of the blade while finning. The channel shape displaces more water, creating more thrust with the same effort. Muscle power is thus transformed into propulsive thrust. The materials used are 3 specific ones for maximum elasticity, high durability and resistance to wear.The main features of the Avanti Excel diving fins are:Anatomical foot pocketWhale tail design for effective foot-paddle power transmissionTri-material fin with Channel Thrust technologyCHANNEL THRUSTSoft longitudinal inserts allow a controlled deformation of the fin blade while kicking. This channel shape moves a greater amount of water resulting in more thrust for the same effort.TRI-MATERIAL CONSTRUCTION3 specific materials for maximum elasticity, high durability and resistance to aging. The result is superior performance in all diving conditions.Age Group: AdultAge Group: Young AdultOriginal Colour by Producer: BlueColour: BlueMade in: ItalyHeel Fins: Full FootMaterial: Thermoplastic RubberMaterial: TechnopolymerSize: 34-35Select Size: 34Select Size: 35Type of Fins: DivingType of Fins: FreedivingType of Fins: Snorkeling