About the Product: This is the Double Bubble (Twice as thick as normal Single Bubble) One Side has a Foil Finish The other side has a White Vinyl finish Some of the pictures in this listing show the foil both sided but this is White/Foil Size 4ft x 100ft TOTAL (400SQFT) TOTAL WILL EQUAL 400SQFT (4FT X 100FT) MAY HAVE SEAMS OF SEPARATE ROLLS TOTALLING 400SQFT The NASATEK White/Foil Reflective Insulation is the most versatile, widely-distributed, energy-efficient product that we manufacture. The characteristics that make it so attractive include ease-of-handling and installation, more than 40+ commercial and residential construction applications, and a large selection of product configurations to accommodate the vast majority of applications / buildings. Distribution of our Double Reflective Insulation is worldwide through Do-It-Yourself Retailers, Contractor Sales Groups and Industrial / Commercial Building Products Suppliers. Description: The product consists of two 96% reflective layers of film bonded to two internal layers of heavy gauge polyethylene bubbles (total thickness 5/16”). A wide variety of widths and lengths are manufactured. (Please refer to “Product Codes/Sizes” below.) Two product edges are available; a “standard edge” and a “staple tab edge”. When the insulation is installed on 16” or 24” centers, or inside cavities, the staple tab edge is easier to work with. (See renders to the left.) Product Benefits (R-value and/or Radiant Barrier) vary per application. A Single Bubble product configuration is also available for special applications, on request.