The black Lens Cover for the EF 75-300mm f/4.0-5.6 III AF Lens from LensCoat is a 100% closed-cell neoprene coat that protects the lens from bumps and scratches. Ideal for nature and outdoor photographers, and for sports shooters and photojournalists. It also provides a thermal barrier, protecting your hands from cold lenses in lower temperatures. The cover is waterproof, providing protection in inclement weather. This version comes in a matte all-black finish to better blend in where desirable. Or, it can be used just for its protection value.