Coefficient of Restitution

A technical measurement of the spring-like effect or energy transfer efficiency between golf club faces and balls at impact, regulated by golf's governing bodies to maintain competitive equity. COR limits prevent excessive ball speeds that could fundamentally change the game's challenge and create unfair equipment advantages. Understanding COR regulations helps golfers appreciate equipment standards and competitive fairness. COR testing ensures clubs meet performance standards while maintaining the game's traditional challenge. Equipment manufacturers must comply with COR limits to produce legal golf clubs for competition.