The lenscoat lens cover for the canon 200 400mm f4 l is usm 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 ideal for nature and outdoor photographers and for sports shooters and photojournalists as the neoprene provides a thermal barrier protecting your hands from cold lenses in lower temperatures the lenscoat