Windsurf

K4 Shark Mini Tuttle Paddleboard,SUP, Windsurf Fins K4 fins have created a unique and new material for windsurfing. OptoFlex is a molded resin long fibre matrix that has been carefully manipulated to provide the perfect flex patterns for windsurfing. Our K4 technicians took a long time to create the perfect material with the qualities needed to provide the performance we now appreciate. Lighter, snappier and with outstanding flex memory. Sold as singles. If you want a pair, please buy 2.