→ The Foam Core Spiral Duct Insulation consists of two highly reflective layers of film (96-percent reflectivity) → The inner layer of insulating foam core resists conductive heat flow while a center layer of polyethylene give our product high reliability and strength (nominal thickness 5/16-Inch) → The product is an ideal alternative to other types of fibrous insulation products for attics, crawl spaces, metal building, garage doors. etc → Ease of handling and quick installation make our Duct Insulation the first choice for insulating round or rectangular ductwork → A thermal benefit of R-8 is gained when installed directly to the duct → Measures 4FT X 10FT → 40FT OF HOOK AND LOOP (VELKRO) TAPE