DaFiN lets you dive right in and make the most of your time in the water. The fin structure offers less drag on the up kick, which greatly reduces leg strain and cramping. On top of that, the strap has been specifically shaped to help avoid blistering, while the use of natural Malaysian rubber makes it one of the lightest surf fins on the market. The low angle wedges on each side of the DaFiN (called "strakes") keep water from spilling off the outer edge of the fin on each downstroke. That, combined with the slightly elevated v-shaped foot pocket, work to trap water and offer more thrust per kick. Don't worry about wearing fin socks, either--the internal durometer rubber is so smooth you won't even need them.