Inside, you'll find a 2.4" high-density foam mattress with a removable and washable cover for added comfort. The 7'5" telescoping aluminum ladder provides easy access, and the hinges and hardware are made from marine-grade 304 stainless steel. The floor is constructed from aluminum honeycomb with insulation, and the zippers are SBS for reliable performance. The driving cover is 1200PVC coated and fully waterproofed.