GL Natural Glass Flex Side Fin Set FeaturesTraditional XXXS side-bite used for longboards and SUP’s. This popular side bite template has a straight trailing edge, flat foil and subtle flex in the tip. Glass Flex. Adds stability and control through turns when used with a 2 + 1 set up. A wide range of conditions from beach breaks to point breaks. Performance longboards, SUP’s and Hybrids.