Product Features, Extremely lightweight. Engineered to fit the foot. Ensures maximum power and thrust for paddling,Product Description,Invented in 1936, Churchill MAKAPUU floating FINS utilize a patented dolphfin design which gives you optimum power and acceleration for catching waves. Makapuu fins also act like a skeg on a surfboard to help maintain total control. The rubber covering your foot is soft for complete comfort while the rubber found on the blade is stiff for more kick power.