I have tried the padhat and decided I had wasted my money. The one I use and really like is the one using plastic corners that can be purchased from Pete Perrim. I then add black foam core and have a strong, light, very efficient sunshade for my ipad air 2. Oddly enough it seems that the plastic corners that work so well are not available in the US or Canada. Pete lives in New Zealand. Pete posted his method and information about the materials a few weeks ago on inspirepilots.