The holy grail of attachment mechanisms for fin shapes and constructions. The simplest and easiest to use tool-less fin system created by our friends at Fin-S. A center spring load so you can lay the fin flat without having to apply extra pressure to the front or back of a fin like most other fin setups. Combined with a lightweight and strong epoxy fiberglass fin for greater thrust and less friction with the water. Accidents can happen, no worries, these epoxy fins float and come standard on most of our high-end boards. More than just tracking devices with swimming abilities - these slim-profile center fins and asymmetrical cupped outer fins - track cleaner, harder and initiate turns more easily.