LensCoat Lens Cover for the Canon 100 - 400mm IS f/3.5-f/5.6 Zoom Lens - Realtree Advantage Max4 (m4) Helps protect the surface of your valuable equipment Custom designed to perfectly fit the Canon 100-400mm IS f/3.5-f/5.6 Lens Helps wildlife photographers to blend in with their surroundings Cover doesn't interfere with mounting or lens operation