This high performance, full-foot fin is based upon the Slingshot technology coupled with the latest in materials innovation which result in comfort and performance
The blade is not directly attached to the front of the foot pocket. The fulcrum point is at the patented mid-foot location, known as the Mid-Foot Flex Joint. This takes the strain off of the toes and ankles, and allows the entire foot to be used, resulting in incredible comfort.
To bridge the gap between blade and foot pocket an “Armadillo” membrane is used. The “Armadillo” is a patented, elongating membrane made out of super-elastic rubber which serves two functions: Accumulates elastic energy during each kick and gives it back at the end of the kick & Make a complete connection between foot pocket and blade, eliminating hydrodynamic gap that water can move through
The foot pocket is made with different thickness zones for better transmission of power from leg to fin. 
Integrated power transmission belt keeps pocket from stretching on power stroke and the low profile eliminates drag and turbulence