Patent ID: 8137214

Claim:
A golf ball comprising: an inner core having a geometric center and a first outer surface, the inner core being formed from a first substantially homogenous rubber composition; an outer core layer formed from a second substantially homogenous rubber composition, the outer core layer having a second outer surface; an inner cover layer disposed about the core, the inner cover comprising an ionomeric material and having a material hardness of about 60 Shore D or greater; and an outer cover layer disposed about the inner cover layer, the outer cover comprising a castable polyurea or a castable polyurethane and having a material hardness of about 60 Shore D or less; wherein the first outer surface has a hardness of up to about 20 Shore C less than a hardness at the geometric center to define a negative hardness gradient inner core and the second outer surface has a hardness of up to 18 Shore C greater than the geometric center hardness to define a positive hardness gradient core.