We use the protective materials to date with Maxi Cosi Isofix base. The documents have to be very solid inserted between the backrest and seat posters, so that they stay in place during storage places and take out of the Maxi Cosi. That's a little unfortunate and troublesome, but with use of a fixed-mounted child seat in the car, this issue will have done. The protective documents is ansich well made, offers a lot of storage space through the large pockets and holds with respect to the protection everything it promises. I do not want to miss, especially because the baby seat is regularly placed on the (street) floor.