I waited a couple of weeks before submitting the review. Thick memory foam. Fit Prius just fine, and Prius has "wings" on the side of the front seats. The belt wraps around the back of the seat just fine. Seat cushion stays in place while driving. Comfotable boost for smaller driver . Taller drivers might hit their head on the roof liner of the car since the cushion raises up the driver. Has zipped cover so it can be removed, washed, and put back onto the cushion. ..More