Aluminum Foil Woven Cloth Insulation uses reflective technology to increase the energy efficiency and comfort level of your home. It is made of a thin layer of woven polyethylene which is sandwiched between two layers of a highly reflective aluminum foil . With the polyethylene woven fabric core, the product cannot be ripped or torn. It blocks 97% of radiant heat transfer, helping keep your home cooler in the summer and warmer in the winter. It also acts as a vapor barrier, keeping moisture from passing through it. They are widely used on roof, wall & floor.