Description: Let fresh air in even when its raining with Chevrolet Accessories Window Weather Deflectors. Let fresh air in even when its raining with GMC Accessories Window Weather Deflectors. Like rolling with your windows down? Weather isn't cooperating? Vent visors allow you to keep your windows slightly open without the worry of rain or snow ruining your interior. Additionally, vent visors don’t interfere with side mirrors while blocking sunlight, keeping your interior cool and reducing wind noise.