Mares Avanti Quattro Plus Fin Maximum efficiency and power. FEATURES 4 channels 4 times thrusting power 20% more powerful than its competitors ABS Plus buckles Avanti Quattro has set the standard for which all fins are measured. It s the world s first with four channels. Its Channel Thrust Technology offers the most versatile choice in all diving conditions. Stabilizers improve stability eliminating ankle-twisting phenomena. Anatomic updated comfortable foot pocket transmits more power to the blade. ADDITIONAL FEATURES Colors: YL,BL,BK, Sizes: S-R-XL Blade: 38cm Material: Thermoplastic rubber/Tecralene Please allow an additional five shipping days for Mares items as they are very popular