I have 4 of these seat saver in various color -lrb- gray and tan - no black -rrb- . I have almost no complaint about these , they do they job . my only gripe be one that I have see mention in other review here , and that be that the back section do not come up high enough ... nowhere near as high as most carseat . as a result -lrb- depend on the carseat you use -rrb- there could be some mark leave on the back of you seat . as for the rest of my review , these seat saver do a great job . they be make of a semus hard rubber material and no matter what the base of you carseat be like , it will not damage or dent the bottom of you vehicle 's seat surface . many of the other brand be just fabric and foam and I feel like some carseat would press right through when anchor down tightly . Might as well use a old towel if that be the direction you be think about go in . a add benefit be these tend to catch a lot of drop snack and cereal and will contain anything spill on they . that be a plus ! as for some of the complaint I have read here , anyone who say that they kid ' carseat move around too much with these seat saver be simply not anchor they carseat tightly enough . I have 4 of these seat saver and have use they in 3 different vehicle over the last 4 year and none of my carseat move . if you find you carseat move around they be not tight enough ... ask someone to help you tighten they . I have never see any discoloration as a result of use these , though I have only use the tan and gray version on tan , gray and black leather seat . I suppose it might be possible for the black seat saver to discolor a lighter color fabric or leather . I also see a review that claim the seat saver stick to leather and destroy the seat . I have never see this happen in 4 year , though if I have to guess base on my experience , a child probably spill some juice on the seat and it eventually `` glue '' the seat saver to the seat . my advice ... clean up spill quickly and clean underneath you kid ' carseat regularly and you will be fine !