A "Twin Fin" is a type of surfboard design characterized by having two fins mounted on the tail. This configuration allows for increased maneuverability and speed, making it popular among surfers who enjoy performing tricks and sharp turns. Twin fins are often favored for their ability to provide a loose and playful ride, especially in smaller waves. The twin fin design gained popularity in the 1970s and is associated with the surf culture of that era. Surfers like Mark Richards helped popularize this style, showcasing its effectiveness in various wave conditions. Today, twin fins continue to be a choice for many surfers looking for a unique surfing experience.