The lenscoat lens cover in forest green for the 600mm f4e fl ed vr af s lens protects the lens with a 100 closed cell neoprene coat offering your valuable equipment some resilience to bumps jars scrapes and nicks the neoprene cover also acts as a thermal barrier making the lens more comfortable to handle in both hot and cold temperatures it also helps break up the shape of your lens making it less noticeable to wildlife the lenscoat cover features clear plastic windows over the auto focu