I'm in TX where the tint place I went to told me that for the front side windows it had to be a least 30%. I went with the best stuff the establishment had - Huper Optik, a German Product that does airplane windows I'm told and is a bit thicker than the competition (takes longer to set as well). I wanted 35%, but it only came in 30%, 40%, and 50%. The Huper 30% seemed a tad darker than I preferred so I went with the 40% all around except the moonroof where I did the 30%. (At certain angles the Huper Optik 40% it still looks pretty dark.) Anyway ,the place was fairly high end I guess as there were two BMWs and a Mercedes in front of me......needless to say I got the "what are you doing here with that POS look" from them as I pulled in with my FiST, but it turned out I was the only one getting the Huper Optik installed; those cheap SOBs opted for the less expensive stuff (still good I was told - Llumar?). The job cost me about $450, but the product blocks the heat better than the other brands (at least the ones offered at this place) which is a necessity on those microwave hot TX summer days.