A halfpipe is a U-shaped structure used in various action sports, including snowboarding, skateboarding, and inline skating. It consists of two sloped sides that rise from a flat bottom, allowing athletes to perform tricks and maneuvers as they ride up and down the walls. The design enables riders to gain momentum and height, making it ideal for showcasing skills. Halfpipes can vary in size and material, with some made of wood for skateboarding and others constructed from snow for winter sports. Competitions often take place in halfpipes, where athletes are judged on their performance, creativity, and difficulty of tricks.