Feature●1/4 inch Thick (AD5 5MM) Double Sided Water Proof Metalized Reflective Foam Core Insulation●Reflects 99.97% Heat Transfer / Sound Deadener / Noise Reducer / Heat Blocker●R8 Insulation and Radiant Barrier in one! / Class 1 Class A Fire Rated●Heavy Duty Metalized Film / Wont pop or Crush Like cheap bubble insulation / Water Proof / Wont Oxidize like Aluminum doesDescription Puncture, Crush and Water Resistant Lightweight, Flexible, Easy to cut and Handle Long Lasting, Non Toxic Stops Heat, Deadens Sound, Wont Absorb Moisture Class 1 Class A Fire Rating, ASTM Certified. 1/4inch Thick (AD5 5MM) Meets all USA and International Fire Codes