Nanuk 925 Customized Replacement Insert Foam 4UP. 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. Specifications for Nanuk T20 Insert Cubed Foam: Manufacturer: Nanuk Color: Black Package Contents: Nanuk T20 Insert Cubed Foam Nanuk 1-925-16723: 925 Customized Replacement Insert Foam 4UP