1. This product uses static electric and atmospheric pressure to attached on the window glass / windscreen, not relying on adhesive tape. If the window glass / windscreen is clean enough, it will guarantee attached on the it.
2. This product can be folded and repeatedly use (take down & reattach as you need). The hotter the sun, the firmer it attached on the window glass / windscre en.
3. Can be stick onto any tinted or insulation paper to improve heat insulation percentage.