The Futures Fins F4 is a standard-issue fin. It'll perform in any situation thanks to an equal emphasis on being flexy yet anchored, drivey off the bottom but steadfast through buried-rail turns. Hexagons (honeycomb) and epoxy keep 'em lightweight. So much firepower you need a permit to sell them. Size Small: 105-155 lbs (47-70 kg). Tri fin set.