The Smart Sole 4 makes the short game easier. Featuring an extra wide sole and improved Feel Balancing Technology, the Smart Sole 4 delivers maximum forgiveness and easier bunker play for those needing more short game assistance. Smart Sole 4 delivers an enhanced three-tiered sole, which makes it easy to get up and down from any lie, especially on bunker shots. With improved Feel Balancing Technology, new aggressive milled grooves and the addition of the "G" model, Smart Sole 4 provides added versatility and makes the short game easier.