The legendary K Sig. The Kirkland Signature Four-Piece Urethane Cover Golf Ball features professional quality ball performance! This four-piece, tour quality ball is encased in a urethane cover, providing a very soft feel, so you won’t have to trade distance for "feel" anymore. The quality construction provides a controlled iron spin, consistent ball flight, excellent green-side control and lasting durability. Kirkland Signature’s speed boosting outer core is engineered to maximize the impact energy transfer for all high and low swing players.