Patent ID: 8298099

Claim:
A golf ball comprising a core layer, a cover layer, and at least one intermediate layer disposed between the core and the cover, wherein said core layer, said cover layer, and said at least one intermediate layer each comprises a cross-linked thermoset rubber composition having a primary rubber component of polybutadiene having a polydispersity of no greater than about 2 in an amount of greater than about 80% by weight and a crosslinking initiator, the core layer having a cis-1,4-polybutadiene content (δ cr ), the at least one intermediate layer having a cis-1,4-polybutadiene content (δ im ), and the cover layer having a cis-1,4-polybutadiene content (δ cv ) such that δ cr ≧δ im ≧, δ cv , wherein a layer outside the core comprises a specific gravity higher than that of the core by greater than about 0.1 g/cm 3 , wherein at least one of the core layer, cover layer and intermediate layer comprises a moisture vapor barrier layer and wherein the overall ball comprises a compression of from 60 to 110 and a coefficient of restitution of from 0.750 to 0.850.