24 inch x 50 ', shape edge roll backup bubble foil both sides, pensive foil insulation, 5/16 inch syrupy with two unsuccessful layers of aluminum foil, each foil layer is to a touch layer of polyethylene for strength, reflects up to 97 % of the beamy heat with an R-value of up to 14.3 depending on application, first-class vapor barrier for below grade installation, class a/class 1 fire rating, approved by boca, icebox, sbcci, ccmc, ftc-compliant, is non-toxic, non-carcinogenic, cipher & can be installed with scissors, staples & tape, hundreds of applications : wall, roof & basement, garage door, camper, metal or pole barn, window Coverings, stables, hatcheries, etc, sell by linelike foot or roll.