The lip is attached to the non-slip side. That way it is concealed when the carpet side is up and it can fold under one side of the non-slip when it is not in use. My dog loves it - he has a good grip and can look out the back or if we put down the arm-rest in the back he can put is head between the two head rests and look forward.

__________________
07 X5 E70 4.8i
04 Z4 E85 3.0