White Hot(r) XG(tm) Putters. Inspired by high-performance, multi-layer golf ball technology, the White Hot XG insert takes two materials with different properties and combines them to take the level of feedback, feel and distance control to an all-new high. The elastomer core material is soft for enhanced feel, and highly resilient to get the ball rolling. The thin outer striking surface with urethane is firmer for fine-tuned responsiveness. The textured impact zone enhances feel and clearly defines the sweet spot.