Pontoon's widest point is the tip. It then gradually gets narrower all the way down to the tail. Also, some skis like the Volant Spatula and Goode Scoop have a reverse sidecut. In a reverse sidecut, the tip and tail are a normal size, but the ski becomes extremely wide at the waist, giving it an ovaline shape. These constructions are thought to provide maximum flotation in extremely deep powder, but they are useless on hard snow. Most people, however, prefer traditional sidecuts, even in powder. References External links A Physics Lesson about turn shape and sidecut Geometry by Donek Snowboards Snowboarding Skiing equipment