What is the Foil in a fin?
Similar to the aerodynamic shape of airplane wings, surfboard fins have a foil – a tapered design that varies from thick at the center to flatter at the edges. This 'bulbous' shape provides lift and influences the board's performance. The fin foil differs based on the type of fin (single, twin, thruster), with side fins often having a flat or slightly inward-curved profile. Center fins typically feature a symmetrical or 50/50 foil on both sides. The diverse foil designs cater to different surfing styles and board configurations.
