The digital camo Travel Coat Lens Cover for Sigma 500 f/4.5 Lens from LensCoat is made of 0.11” (3.00mm) thick shock-absorbing closed cell neoprene. It is custom tailored to fit your lens and provides protection that allows you more valuable room for packing and storage. It slides over the lens quickly and easily with a hook and loop fastener closure. You can use it with the appropriate Hoodie for complete lens protection.