On the floor of an MX5 NB (1998 - 2000), upholstery gets exposed to sand, moisture, pebbles and wear from getting in and out of the car on a daily basis. Mats catch most of that load and keep dirt better away from carpet, attachment points and seams in the floorboard. Especially on cars that are regularly driven open, you see that dust and moisture find their way in more easily. When floor and interior panel finishes are also kept in neat condition, the interior immediately feels more cared for.
