A/V-ST stands for Aluminum Stringer and Vinyl Skin Technology, which is the formula behind our #perfoamy. The double T-Aluminium Stringer provides the needed stiffness and drive and allows the Foamy to perform just like a normal surfboard. A thought but soft Vinyl Skin was specially developed to finish off the FOAMY construction. It is wrapped around the hand shaped core and fixed by the PVC rubber band.