The mats I purchased as "S-line" are rubbish nylon inferior quality with shoddy granular rubber backing. Certainly NOT Audi quality and cheap and nasty. I sent the rear mats back with the Audi original rear mats backs from my S4 cabriolet so they could take a pattern as they could not fathom why the ordinary A4 mats would not fit the rear of my car. Very slow in resolving my complaints and would not refund postage or send my mats back until I returned the fronts, the whole fiasco cost me over £15.00 in postage. Next time just buy from Audi if you want something of similar quality.