It's really quite ingenious. When the seat back frames were made, they removed some material, I presume to lighten up the seat. The mat has holes in it that line up with a hole in the seat back so all you do is lay the seats down and place the mat over them, use an awl to poke through the carpet on the back of seats through the holes in the mat, and then push in the supplied plastic pins to hold the mat in place. Someone for sure had there thinking ahead cap on that day. . . I'm intruiged by this, and curious about the attachment mechanism to the back of the seats . . .