A Sail Model boat is a type of miniature, sail-powered boat. Generally, these boats are made out of fibreglass and measure 12-24 inches in length. They feature rigging that allows them to be sailed and require no batteries or motors for propulsion. Sail Model boats are designed as either racing yachts, one-design vessels, or scale model reproductions of historic full-size boats. Racing Sail Models requires skill, which is often tested in races between boats or contest races against the clock. Sail Model boats are becoming increasingly popular as a hobby and open-water boats due to their portability, affordability and challenge.