Owens-Corning 541799 R-10 Attic Stairway Insulator, For Openingsup To 24.5 By 54" Available in one standard size to fit most attic stairwell openings; made from R-10 insulation with durable foil facing on both sides Helps reduce heat loss in the winter and heat gain in the summer No assembly required-simply unfold and place over attic opening Can be easily removed to access the attic GREENGUARD certified; made in the USA