The lenscoat lens cover for the sigma 50 500mm f4 63 ex dg 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 where the forest green pattern helps break up the shape of your lens making it less noticeable to wildlife and allowing you to blend in with your surroundings len