The forest green camo Lens Cover for Sigma 150-600mm f/5-6.3 Contemporary Lens from LensCoat is a waterproof neoprene cover that protects your lens from scrapes and bumps helping to preserve its resale value. The lens cover provides a thermal barrier during cold weather, and breaks up the shape of your lens, making it less visible to wildlife. For ease of use, there is a clear plastic window allowing you to access the AF controls and the distance scale, and an orientation hole for viewing the red dot indicator, which allows you to mount the lens on your camera without removing the lens cover. The cover includes an extra, easy to install and remove, touch-fastened piece for when you need to zoom the lens, and two additional pieces for use with the rotating tripod collar.