A golf ball comprising a core, an inner cover layer, and an outer cover layer, the outer cover layer being formed from a polyurea including a caprolactone-free prepolymer of an aliphatic isocyanate mixture comprising dimerized uretdione of HDI and trimerized isocyanurate of HDI (or, optionally, trimerized biuret of HDI) and a first amount of modified polyoxypropylene diamine having a formula: where x=1-70; R.sub.1 and R.sub.2 each independently=a C.sub.1-20 alkyl group, phenyl, or a mixture thereof; and R.sub.3.dbd.H, CH.sub.3, or a mixture thereof; and a curative including a mixture of 3,5-diethyl-2,4-toluenediamine and 3,5-diethyl-2,6-toluenediamine.