The Rain-X 630168 Glass Water-Repellent Aerosol 12 oz. brings you all of the performance you have come to expect and love from the original Rain-X glass treatment to an aerosol version to make the application process faster and easier. This Treatment dramatically improves wet weather driving visibility. Simply apply the treatment to exterior glass and watch the raindrops fly off your windshield while driving. Rain X helps improve visibility by repelling rain, sleet and snow. In tests conducted by a major university, better visibility improved driving response time up to a full second or more. At highway speeds, thats almost four car lengths of extra stopping distance.