The Realtree AP SnowTravelCoat Lens Cover for Canon 600mm f/4 IS II Lens from LensCoat is a 3.0mm thick shock-absorbing closed-cell neoprene lens cover that is custom tailored to fit the lens without its lens hood. It is designed to fully protect the lens from bumps, scratches, and abrasions when not in use, without the need of a more traditional bulky lens case. The trim fit of the coat permits you to have extra storage space when you're packing for that long photo excursion—or even a day trip. The coat simply slides over the lens and closes with a secure touch fastener. A realtree AP snow TravelCoat is useful in autumn or early winter when there is snow on the ground and there is a trace of foliage left on the trees. Use with the appropriate optional Hoodie for complete lens protection.