2015 Wilson Staff FG Tour Soft Urethane Golf Balls Advanced 4-piece golf ball construction The soft core provides feel and low driver spin Two mantle layers promote maximized velocity and the cast urethane cover generates tour-quality spin and control 70 Compression: This groundbreaking technology provides the softest feel of any high performance urethane golf ball 318 Dimple Pattern: This ball guarantees a stable and penetrating flight trajectory in even the toughest wind conditions