Some sort of all-weather mats are an absolute necessity. Carpet mats are magnets for grit, salt stains, etc., and can't be hosed off and put back in right away. I looked at all the options:
- Hexomat, like my cargo liner
- WeatherTech (had them in a previous car, liked them a lot)
- Audi 'Monster' mats, which are similar to the WeatherTech design but have 'A3' printed on them
- Audi Euro Rubber mats
I ordered them from AutoWebAccessories, which sells genuine accessories at a discount. They were backordered nationwide, but I got mine as soon as they were available in the country. They work great, and I highly recommend them.
One problem was that the snaps were so tight that they could have ripped the fastener out of the carpet. Scraping the inside of the snap on the mat with a knife made them snap on well, but not insanely tight. They give the interior a neat, sporty look. In the photos below they look like they contrast a lot with the carpet, but that's mostly due to the camera flash. In reality, the black mats are very subtle against the black carpet: