As we were headed onto the Interstate via the on ramp I-44 west in St. Robert MO we had the from passenger and driver side windows down and we heard a loud POP as the front tempered glass panel of our panoramic sunroof/moonrise shattered above us cutting my arm and back. Sunny day no vehicles in front or behind us to kick up a rock or anything. This is clearly a defect in the design of the 2018 panoramic glass panels as later models top glass have a different style and design.