Concave Meaning in Surfing

Concave refers to the inward curve on the bottom surface of a surfboard. This design feature channels water from the nose toward the tail for speed. The shape creates lift and reduces drag as the board moves through surf. Single or double concave patterns affect how the board handles and turns in water. A deeper concave helps a surfer maintain control at very high riding speeds. This curve acts like a jet of water pushing the surfboard forward faster. A surfer feels the board lift as water flows through the bottom concave. Small adjustments in these curves change the performance of the surfboard in waves. One athlete zooms across a flat section thanks to the lift from concave. Modern shapers use this feature to enhance the maneuverability of high performance surfboards.