The black Lens Cover for the Canon 70-200mm f/2.8 Non-IS Lens from LenCoat 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.
The cover is waterproof, providing protection in inclement weather. http://www.lenscoat.com/lenscoatreg-canon-70200-p-324.html