Traditional rubber fin Closed fin blade reduces the resistance at the upwards movement and increase Druck in backwards motion. Short and wide fin blade offers maximum operation and high push and glide. Purpose-built buckles keep the spring straps in optimal position. The material of the fin withstands extreme conditions temperatures and scuffs. Apeks rk3 fins Designed in collaboration with the US Military and known for outstanding performance and reliability is the Apeks rk3 fin made from thermoplastic rubber. The fin is decorated with a oversized foot pouch for to use with solid boots and includes spring straps making it easy to put on and take off. The rk3 fin is standard equipment on military special Berufstauchern coast guard and public safety divers for years. C Traditional rubber fin C Short and Wide Fin Blade provides maximum operation and high manoeuvrability. C Closed blade reduce the resistance at the upwards motion and increases pressure on backwards motion. C The material of the fin resistance to extreme conditions temperatures and scuffs. /The openings on eliminate that goes around the back of the flipper can be a problem. C Spring Straps custom fit buckles keep the spring straps in optimal position.