3 piece surlyn balls bridge the gap between a standard two piece surlyn ball which maximizes distance but does not have very good short game control, and a multi-layer urethane ball which provides both distance and superior spin control. The 3 piece surlyn will increase the spin characteristics of a 2 piece surlyn and also provide good distance. The main reason usually for choosing a 3 piece surlyn ball is price. It is usually in between the price of a 2 piece surlyn and a multi-layer urethane ball.