The black TravelCoat for the Canon 300mm f/2.8 IS I/II AF Lens from LensCoat is a 3mm-thick, shock-absorbing, closed-cell neoprene lens cover. It is designed to fully protect the lens when not in use with the lens hood on in the reverse position. The coat simply slides over the lens, and closes with a secure touch fastener. This version is matte black to better blend in when you are shooting in low light environments. Or, it can be used just for its protection value.