Reach Barrier DD48025 Reflective Air Insulation features two layers of sealed air which are laminated between two layers of durable reflective polyethylene. This gives the ability to retain air longer and provides excellent insulation and sound reduction. The insulation roll is easy to install because there is no mess or fumes and will not cause itchy skin. Reach Barrier reflective air insulation is ideal for: Attic spaces, exterior and interior walls, interior masonry walls, radiant floors, metal and steel buildings, knee walls, crawl spaces, garage ceilings and many other applications where insulation is needed. Reach Barrier reflective insulation products are one of the most versatile and energy efficient insulation products available, with proven effectiveness to decrease energy usage and cost by reducing summer heat gain and winter heat loss. Installing a radiant barrier may be the lowest-cost improvement that can produce the greatest overall reduction in energy usage and expense.