Now you can stop unpredictable glare from becoming a serious driving hazard. Our ultra-sized Glare Reducer is three times larger than our earlier version--a full 21" X 6.4"-- and it works in any car or truck, regardless of where the mirror is attached. Made of patterned static cling material, it's simple to position (or re-position, if necessary), and trims easily. A unique, patented measuring tool lets you mark and cut the Glare Reducer so it fits exactly around the base of your rear view mirror. You won't need to worry about piercing beams getting through unnecessary gaps, and you can still clearly see traffic signals.