24 inch x 10 ', tract edge roll stunt man bubble foil both sides, musing insulation, 5/16 inch jellylike with two out layers of aluminum foil, each foil layer is to a bad layer of polyethylene for strength, reflects up to 97 % of beamy heat with an r-value up to 14.3 depending on application, first-class vapor barrier for below grade, can be used for beamy floors, crawl spaces, channel insulation, metal buildings, basement walls & attics, product has been evaluated by the Following : icbo, ccmc, boca, sbc & dade county, easy applied with tape & staples.