The Utah Highway Patrol publishes the summary drivers actually need, citing Utah Code 41-6a-1635. The windshield must let more than 70% of light through, with non-transparent material allowed only along the top edge, to the AS-1 line or the top four inches, or in the lower left-hand corner within a three by four inch limit. Front side windows must allow at least 35%, and a 5% variance is allowed when a peace officer meters the light. Behind the driver you can go darker, provided the car has both left and right side rear-view mirrors. Material with a metallic or mirrored appearance is prohibited on any window. For the full detail, visit our Utah window tint laws page. Neither Kepler ceramic range is a metalized, mirror-look film, so it is the shade you choose for the front side windows that needs the attention.
A violation is classified as an infraction, and the Highway Patrol's published guidance carries an effective date of 7 May 2025, so check the figures as they stand when you buy. They describe the light coming through the finished window, not the film on its own.