Mine rotates itself all the time, gets adjusted daily. This is my fault I chose not to use the included clips! If you use the clips the mats stays put but wears twice as fast!mine's[it's a proper mercedes ribbed one] like an old lettuce, no stiffness to it all - curls up against tranny tunnel and then starts folding over on itself - I used to straighten it at least once a day - have given up now though - it's like an old dog blanket now