Golf ball having core composed of a highly neutralized polymer

1. A golf ball comprising:

a core composed of a fully neutralized polymer material;

an inner mantle layer disposed over the core, the inner mantle layer having a thickness ranging from 0.030 inch to 0.100 inch, the inner mantle layer material having a plaque Shore D hardness ranging from 30 to 50, the inner mantle layer composed of an ionomer material;

a first center mantle layer disposed over the inner mantle layer, the first center mantle layer having a thickness ranging from 0.030 inch to 0.050 inch, the first center mantle layer material having a plaque Shore D hardness ranging from 40 to 55, the first center mantle layer composed of a fully neutralized polymer material;

a second center mantle layer disposed over the second center mantle layer, the second center mantle layer having a thickness ranging from 0.030 inch to 0.050 inch, the second center mantle layer material having a plaque Shore D hardness ranging from 45 to 55, the second center mantle layer composed of a fully neutralized polymer material;

an outer mantle layer disposed over the second center mantle layer, the outer mantle layer having a thickness ranging from 0.030 inch to 0.050 inch, the outer mantle layer composed of a blend of ionomers, the outer mantle layer material having a plaque Shore D hardness ranging from 60 to 75; and

a cover layer disposed over the outer mantle layer, the cover having a thickness ranging from 0.025 inch to 0.040 inch, the cover composed of a thermoplastic polyurethane material, the cover material having a plaque Shore D hardness ranging from 40 to 50, and the on cover Shore D hardness less than 56;

wherein each of the mantle layers has a density substantially equal to the density of the core.

2. The golf ball according to claim 1 wherein the inner mantle is composed of a fully neutralized ionomer material.