• By utilizing various materials‘ stif fness and innovative structural arrangements, SUMi was designed to produce propulsion efficiency. The end result is a pair of fins which is not only easy to kick with, but excellent momemtum is created to in the process to quickly propel the diver forward. • The fin’s foot poc ket fitting i s the result of our extended research and manufacturing experience. This is an often neglected criterion when divers choose their fins. We are confident that SUMi will be one of the most comfortable fins that people put on. • On top of the fin blade there are 6 water channelling guides to direct large amount of water backwards and the 22º blade-to-foot angle provides the best kicking efficiency.