Easier to heat and cool
The R-value system was created by the fiberglass industry and is not the end-all in understanding heat and cold retention. From a practical standpoint, customers who have foil backed insulation used in their projects are very happy. They find that these structures are easy to heat in the winter and stay cooler during hot summer months.
Just think about a foam cup with hot coffee or cold soda, when holding it in your hand you can barely feel the difference in temperature. Next, take your foam cup and add an additional space blanket to the outside, this is essentially what this product is. Science and technology working together beautifully.