AUTOMOTIVE BALL JOINT BOOTS, TIE ROD BOOTS AND CV BOOTS. Polyurethane boots are more efficient for a car operating under tough road conditions and they have better wear resistance than rubber boots. Used for tuning, heavy duty applications and especially in low temperatures. The polyurethane boot will secure a long life for your ball joints and save you money. Polyurethane dust covers on a car will give a tangible benefit.