I spent some time this afternoon talking with a guy who had all the windows in his newish (2014?) Ford minivan filmed with no tint, and he said that the difference in interior temps is amazing. The film he used was the stuff that I had bookmarked but could not remember the name of, 3M Crystalline. The Crystalline is 3M's high-end product, and is only available through select tint shops who have gone through special training. 3M also limits the number of shops that are allowed to apply it, so there will never be more than one legitimate shop in any given market area. Stuff is expensive, $1,000 for the minivan. Probably be about that for a Suburban, less for a truck. I sat in the van for awhile and looked through the windows with glass up and down. The film is dead clear and you can't tell there is any film on the glass. The only thing I could see was the factory tint in the glass itself. Gotta get me some.