Odyssey White Hot 2.0 XG 9 Putter Multi-Layer Insert The insert is constructed of a soft elastomer core thats highly resilient for exceptional feel and truer roll. A thin, firm outer striking surface infused with urethane provides fine-tuned responsiveness. Tour-Proven Head Shapes Tested, accepted and played by some of the best players in the world, White Hot XG Putters are available in numerous head shapes, allowing every golfer the opportunity to find the model to fit their game.