Patent ID: 7582026

Claim:
A golf ball which comprises a spherical core and a cover positioned outside of the core and formed by a thermoplastic resin composition, said core having an inner sphere, a first mid layer positioned outside of the inner sphere and formed by a thermoplastic resin composition, and a second mid layer positioned outside of the first mid layer and formed by a thermoplastic resin composition, said second mid layer having a hardness Hs which is greater than a hardness Hf of the first mid layer and a hardness Hc of the cover, said cover having the hardness Hc of equal to or less than 50, and a product (Tc·Hc) of a thickness Tc (mm) of the cover and a hardness Hc of the cover being equal to or less than 25, wherein a sum (Tf+Ts+Tc) of a thickness Tf of said first mid layer, a thickness Ts of said second mid layer and a thickness Tc of said cover is 0.5 mm or greater and 3.7 mm or less, and wherein the hardness Hc of said cover is smaller than a central hardness Hi of the inner sphere.