The Gorilla Grip Kai Traction Pad uses an evolution of the Diamond II the Diamond III. The Kai was designed for extreme surfing. The Diamond III groove features a more spaced out groove pattern allowing your foot to sink down and lock into the pad. High quality foam is used to make a tail pad that's lighter on your board and easier on your skin. Gorilla Grip Traction Pads have a unique "G-Cell" Foam (used in the Kai Pad) which is the highest quality Traction Pad material on the market. Gorilla Grip also uses 3M adhesive backing for long lasting hold.