EGR 63411 WindowVisors Dark Smoke 2-Piece Window Visors Crack your window (even in driving rain) for fresh air circulation &amp; prevent fogging of windows for safer driving Leave windows cracked on hot days - return to a cooler, dry interior (even if an unexpected rain shower occurs) Proven 3M automotive grade double-sided tape for easy installation Made from durable, UV stable, scratch resistant material Limited Lifetime Warranty