Made since 1936, the Patented and Trademarked, Churchill Makapuu Floating Fins, have become standard equipment in performance bodyb boarding and are also the original swimfin. Each natural rubber fin is individually inspected for quality. The Makapuu fin was created to resemble a dolphin tail, which will give you the most thrust and performace out of any fin on the market. The Makapuu fin is made of 100% natural gum rubber and they float!