A golf ball comprising a core and at least one layer formed about the core is disclosed. The layer may be composed of a material formed from reactants comprising at least one polyisocyanate and at least one polyaspartic ester, such as N,N'-di(ethylmaleate-amino)-dicyclohexylmethane, N,N'-di(ethylmaleate-amino)-dimethyl-dicyclohexylmethane, N,N'-diethylmaleate-2-methyl-pentamethylene diamine, or a blend thereof. The layer may be an intermediate layer, an outer cover layer, or a coating layer.