Patent ID: 7029406

Claim:
A golf ball comprising an elastic core, an intermediate layer of at least one layer formed of at least one ionomer resin enclosing the elastic core, and a cover which is formed of at least one thermoplastic or thermosetting urethane resin and provided on its surface with a plurality of dimples, wherein the cover has a gage of 1.0 to 1.5 mm, and a Shore D hardness of 45 to 63, the intermediate layer has a gage of 1.0 to 2.0 mm per layer and a Shore D hardness of 50 to 70, and which is harder than the hardness of the cover, wherein a phantom sphere is given on the assumption that the cover surface is free of dimples, the total of the volumes of dimple spaces each delimited by a concave wall of a dimple and the surface of the phantom sphere is 1.1 to 1.6% of the volume of the phantom sphere, and the golf ball in its entirety has a specific gravity of at least 1.128 g/cm 3 .