The name may be ‘One', but there are actually three of them. Nike's One Tour is a four-piece ball designed with accomplished players in mind. A progressive density core is encased in a polymer ‘power transfer layer', with an inner cover and seamless urethane outer cover with a 378-dimple design. The three-piece One Tour D is designed for golfers with moderate-to-high swing speeds while the One Vapor is intended for lower speeds.