The Realtree Max5 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. The Realtree Max5 pattern offers effectiveness in open terrain. The pattern features detailed cattails, millet, milo, corn stalks, sunflowers, oak and maple leaves, cedar and oak limbs, plus a variety of other plant life.