48 inch x 10 ', hand tool edge roll human bubble foil both sides ruminative insulation, 5/16 inch heavy with two layers of aluminum foil, each foil layer is to a touch layer of polyethylene for strength, reflects up to 97 % of effulgent heat with an R-value up to 14.3 depending on application, can be used for effulgent floor applications, crawl spaces, passageway insulation, metal buildings, basement walls & attic 's, product has been evaluated by icebox, boca, ccmc, sbc & Dade county, well-to-do to install with tape & staples.