A surf ski is a long, narrow and lightweight craft similar to a kayak but with an open "sit-on-top" (SOT) cockpit and a self-bailer to eliminate water instead of the enclosed kayak-style cockpit which can be sealed against the elements with a sprayskirt or tuliq. Surfskis are primarily designed for speed, including fast runs on the open seas, and have a powerful, pedal-operated rudder to control the boat while surfing on wave fronts.