Reflective Foam Insulation with Foam Core, 2 Sides Reflective Radiant Foil. Cold and heat Resistance, Waterproof, moisture barrier, and Sound Resistance Barrier. 1/4 inch thick (mfg. guarantee spec .225 – .275 with disk micrometer gauge) CLOSED-CELL POLYETHYLENE FOAM: enclosed between 2 layers of radiant reflective film. Strong and lightweight yet durable material that is easy to cut, and install and can be taped, stapled, or nailed onto almost any surface. EFFECTIVE THERMAL RADIANT BARRIER: Reflects up to 97% of radiant heat energy. Helps prevent heat from entering during the summer season. WATER AND MOLD RESISTANCE: While being an effective humidity and moisture barrier as well. SOUND REDUCTION: Effectively reduces sound travel creating a sound-reduction environment. Can be used in commercial and residential construction applications.