A golf ball having a CoR of at least 0.700 and an Atti compression of at least about 50 and comprising at least one layer comprising a mixture of an ionomer composition and a plurality of particulates, wherein at least a portion of the plurality is surface-treated with alkoxylated siloxanes, polyether-modified siloxanes, or combinations thereof;
- wherein the particulates are selected from the group consisting of titanium dioxide particles, barium sulfate particles, zinc sulfide particles, zinc oxide particulates, or combinations thereof;
- wherein the plurality of particulates is included in the mixture in an amount such that the at least one layer has a specific gravity of from 0.5 to about 5.0 and greater than a specific gravity of the ionomer composition;
- and
- wherein the plurality of particulates creates a specific gravity gradient within the least one layer;
- and
- wherein the at least one layer is an intermediate layer and/or a cover layer.