Maximum efficiency and power 4 channels 4 times thrusting power 20 more powerful than its competitors ABS Plus bucklesAvanti Quattro has set the standard for which all fins are measured. It"s the world"s fi rst fi n with four channels. Its Channel Thrust Technology offers the most versatile choice in all diving conditions.Stabilizers improve stability eliminating ankletwisting phenomena. Anatomic foot pocket transmits more power to the blade. Colors: YL,BL,BKSizes: SRXLBlade: 38cmMaterial: Thermoplastic rubber/Tecralene