ATTIC TENT vs. OWENS CORNING ATTIC STAIR INSULATOR
Actually, neither of these products meet Energy Code: "403.2.3 Access hatches and doors. Access doors from conditioned spaces to unconditioned spaces (e.g., attics and crawl spaces) shall be weatherstripped and insulated to a level equivalent to the insulation on the surrounding surfaces." Attic Tent is R-3, but R-38+ is required!
Battic Door makes an R-50 Kit to insulate attic stairs that meets all Code requirements.