Made of high-quality polyurethane foam, the multi-layered set of customizable inserts includes a pre-scored removable layer*. This layer consists of foam squares that can be removed in various configurations to accommodate the contents of the case. This solution is ideal if you are seeking a quick and easy way to protect and organize your items. * Exception: Nanuk 985, 988, 990 , 991 , 995 and 996 foams have full foam layers only.