The Realtree AP Snow TravelCoat for the Canon 400mm f/2.8 IS AF Lens I/II from LensCoat is a 3.0mm thick, shock-absorbing, closed-cell neoprene lens cover designed to be used without the lens hood. It was designed to fully protect the lens when it is not in use, without the need for a more comprehensive lens case. It allows more room in your camera bag for other necessities. The coat slides over the lens, and closes with a secure touch fastener. Realtree AP Snow allows your lens to blend in with snow-covered trees, bushes and rocks.