Product features: Save labor with easy installation methods. Rugged silicone or neoprene materials offer a high resistance to cracking, rotting and leaking. Instant and quick, Boots are installed without special tools. Product utility: CV refers to constant velocity joints, which are used to transfer a constant force to the wheels as well as supporting the movement of the suspension system. CV boots attach to the ends of a drive shaft, protecting it from water getting in and grease getting out.