The FCS M3 moulded composite fin with engineered flex and tip response. Featuring IFT, this reliable template can be used in a variety of conditions and surfboard models. Glass Flex has been formulated to replicate the flex and memory properties of hand layed fibreglass. Its advantages over other composite fin materials include stiffness, a more positive flex pattern (nice tip flex, little base flex) and remarkable flex memory. The precision of the injection moulding process ensures the highest accuracy in geometry in each fin produced.