Not all fins fit the same fin boxes. Before purchasing fins, it’s important to know which fin boxes your board has. If you need a separate fin box, you can find them here. The different fin boxes that exist are FCSI, FCSII, Futures and US box, also know as the Single Fin. Would you like to know which fin combinations are possible? Check out the Ultimate Surfboard Fin Guide! The many options got you confused? Drop by at our shop for personal advise!