Travelcoat covers are made of 3mm thick shock-absorbing closed cell Neoprene. Custom tailored to fit you lens providing protection allowing you more valuable room for packing and storage. Slides over lens quickly and easily with a Velcro closure. The travelcoat for the Canon 600 f/4 is II is available in two different styles to fit your packing/storage preference. One model is for use with out the hood on the lens and the other model is for people who put the lens hood on the lens in the reverse position.. use with the appropriate hoodie for complete lens protection. Travelcoats are available in black, Forest Green, Realtree Max4, Realtree AP snow, and digital Camo. ** compatible stock or replacement foot *** works great with a LensCoat lens cover.