The forest green camo LensCoat Lens Cover for the Tamron 100-400mm f/4.5-6.3 DI VC Lens is a 100% closed-cell neoprene coat that protects the lens from bumps and scratches. It is useful for nature and outdoor photographers as well as sports shooters and photojournalists. It provides a thermal barrier to protect your hands from the cold lens surface in lower temperatures. The cover is waterproof and protects your lens in wet weather.