The LensCoat Cover for the Sigma 70-200mm EX DG Lens in black is a 100% closed-cell neoprene coat that protects the lens from bumps and scratches. Ideal for nature and outdoor photographers, sports shooters, and photojournalists. This cover also provides a thermal barrier for your hands, protecting them from cold lenses in lower temperatures. Additionally, this cover is waterproof, protecting your lens in wet, inclement conditions.