ISIS Rasta Memory Foam Case for 13 Inch Macbooks (Tan) 13 inch Macbooks 5mm of memory foam core Reverse zipper, custom molded zipper tabs, and a neoprene lip which protect from zipper scratches Extra-thick, memory foam, interior lip, screen straps, and gold zipper heads Memory Foam is a feather weight, heat resistant, NASA engineered foam built to absorb shock and light impact