The lenscoat lens cover for the canon 500mm f4 l is ii lens protects the lens with a 100 closed cell neoprene coat offering your valuable equipment some resilience to bumps jars scrapes and nicks easy to install and remove leaving no residue on the lens lenscoat lens covers are also suited to sports shooters and photojournalists as the neoprene provides a thermal barrier protecting your hands from cold lenses in lower temperatures the lenscoat lens cover features clear plastic windows