A peroxide-curable polyolefin composition comprising a peroxide-curable polyolefin prepolymer, an organic peroxide, and 4-[[4,6-bis(octylthio)-1,3,5-triazin-2-yl]amino]-2,6-bis(1,1-dimethylethyl)-phenol. Also, a peroxide-cured polyolefin product prepared therefrom, methods of making and using same, and articles containing or made from same.