The initial surfboard used was about 5 meters long and weighed 50-60 kilograms. After the Second World War, foamed plastic boards appeared, and their shapes were also improved. The surfboard currently used is 1.5-2.7 meters long, about 60 centimeters wide, and 7-10 centimeters thick. The board is light and flat, with slightly narrow front and rear ends, and a stabilizing tail fin at the lower back. In order to increase friction, a waxy outer film is also coated on the surface of the board. The weight of all surfboards is only 11-26 kilograms.
There are some ripple structures on the front side of the wings of the humpback whale, which help this behemoth move more elegantly and smoothly in the water flow. This structure can help reduce resistance and help humpback whales "catch" the water flow, ensuring that they can still move agile despite having a huge body. Inspired by this, surfboard manufacturers have produced characteristic surfboards with corrugated front ends.
