Hi-Spring Core: A core made from soft flexible materials with increased elastic components delivers better and softer feel with an ultra-low 40 compression. Speedmantle with HFMq: A firmer second layer surrounds the soft inner core and allows for an explosive transfer of energy and increased ball speeds. 100% Urethane Cover: A soft, cast urethane cover allows the grooves of the wedge to better grip the golf ball for increased green-side spin. A crosslinking chemical reaction forms the urethane material, which creates an irreversible link for improved shear resistance and greater durability.