The LensCoat Lens Cover for Tamron 70-200mm f/2.8 Di LD (IF) Macro Lens (Black) is a 100% closed-cell neoprene coat that protects the lens from bumps and scratches. It is ideal for nature, outdoor photographers, sports shooters and photojournalists. It also provides a thermal barrier, protecting your hands from cold lenses in lower temperatures. It features a clear plastic window that permits you to read the distance scale on the lens. The cover is waterproof, providing protection in inclement weather.