The realtree max4 HD Travel Coat For the Canon 400mm f/4.0 DO IS AF Lens from LensCoat is a 3.0mm thick shock-absorbing closed-cell neoprene lens cover. It is designed to fully protect the lens when not in use, without the need for a more comprehensive lens case. It allows more valuable room for packing and storage. The coat simply slides over the lens, and closes with a secure touch fastener. The Realtree Advantage Max4 HD camouflage pattern offers maximum effectiveness in open terrain. The pattern incorporates cattails, millet, milo, corn stalks, sunflowers, oak and maple leaves, cedar and oak limbs, plus a variety of other plant life into the largest camouflage artwork on the market.