The diono ultra mat is a car seat protector with a difference the full length mat protects the base and back of the seat featuring pentalock technology with 5 carefully constructed layers ultra mat completely protects your car upholstery against scratches and dents from a child car seat the high density foam core and durabase layer distribute the car seat weight and prevent indentations in the vehicle upholsteryleather a handy tab slips between the seat base and back to keep the mat in pos