Thrust through the water with four times the power with these comfortable fins, which deliver increased efficiency with the use of new hi-flex material inserts that allow for a controlled deformation of the fin blade while kicking. Made of thermoplastic rubber and Tecralene, it comes equipped with the patented Mares bungee strap for a comfortable, secure fit. Two year limited warranty.SizeSmallRegularExtra Large*Blade14 5/8" (37cm.)15" (38cm.)15 5/16" (39*Blade is measured from the end of the footpocket to the end of the blade.