Fins on surfboards are too important a matter for us not to seek out the best. Single fins, twins, thrusters (tri fins), quads, combos, 2+1, 1+2 and side bites must be chosen delicately. The right fin choice will depend on your size (grom fin size available too), riding style, and your surfboard’s fin box.The Sweep (rake), Base Length, Foil, Flex, Height and Cant (tilt of the fin in degrees) are important measurements of every surfboard fin, and should be considered when choosing your next surf fins.