Callaway Men s 07 XTT Grand Slam : Designed for golfers who are serious about the performance of their golf shoe, with comfortable, waterproof Pittards Leathers, XTRA Traction Technology and the Big Bertha Spike for state-of-the-art traction. Features: Rubber/EVA Sole Big Bertha Spike With XTT Technology Drysport Comfort System XWT Width Waterproof Leather