introduced the World Class "80 Mold" 165 gram frisbee. This disc quickly replaced the relatively light and flimsy Master frisbee with much improved stability and consistency of throws even in windy conditions. Throws like the flick and hammer were possible with greater control and accuracy with this sturdier disc. The 80 Mold was used in ultimate tournaments even after it was discontinued in 1983. Discraft, founded in the late 1970s by Jim Kenner in London, Ontario, later moved the company from Canada to its present location in Wixom, Michigan. Discraft introduced the Ultrastar 175 gram disc in 1981, with an updated mold in 1983. This disc was adopted as the standard for ultimate during the 1980s, with Wham-O holdouts frustrated by the discontinuation of the 80 mold and plastic quality problems with discs made on the replacement 80e mold. Wham-O soon introduced a contending 175 gram disc, the U-Max, that also suffered from quality problems and was never widely popular for ultimate. In 1991 the Ultrastar was specified as the official disc for UPA tournament play and remains in wide use. The popularity of the sport spread quickly, taking hold as a free-spirited alternative to traditional organized sports. In recent years college ultimate has attracted a greater number of traditional athletes, raising the level of competition and athleticism and providing a challenge to its laid back, free-spirited roots. In 2010, Anne Watson, a Vermont teacher and ultimate coach, launched a seven-year effort to have ultimate recognized as full varsity sport in the state's high schools. Watson's effort culminated on November 3, 2017, when the Vermont Principals Association, which oversees the state's high school sports programs, unanimously approved ultimate as a varsity sport beginning in the Spring 2019 season. The approval made Vermont the first U.S. state to recognize ultimate as a varsity sport. Players associations In late December 1979, the first national player-run ultimate organization was founded in the United States as the Ultimate Players Association (UPA). Tom Kennedy was elected its first director. Before the UPA, events had been sponsored by the International Frisbee Association (IFA), a promotional arm of Wham-O. The UPA organized regional tournaments and has crowned a national champion every year since 1979. Glassboro State College defeated the Santa Barbara Condors 19–18 at the first UPA Nationals in 1979. In 2010, the UPA rebranded itself as USA Ultimate. The first European Championship tournament for national teams