→ TOTAL WILL EQUAL 400SQFT (4FT X 100FT) → MAY HAVE SEAMS OF SEPARATE ROLLS TOTALLING 400SQFT The 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. → 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