Light weight heat insulation mat for duct. Double layer bubble structure, foil on both sides, reflective foil insulation. Polyethylene on both sides of foil for strength, reflects up to 97% of radiant heat with R-value 14.3. Class 1 fire rating. Non-toxic, non-carcinogenic. Can be installed with scissors, staples and tape. Can be used on wall, roof, basement, garage door, camper, metal.