I'm ordering my third roll right after I write this review. This product does exactly what it says that it does. If someone reviews this with less than 5 stars, they didn't take the 5 minutes of time to learn how it works.Because this reflects radiant heat, you need to leave an air gap to the warmer side- or else it will not work at all. It's not flimsy by the way. It takes a lot to rip or tear. I have installed this in the attic of two of my houses, under the metal roof of my garage and in a cabin, with great results in each location. I have been impressed with the performance each time.