Wish I had more to provide but I just use all weather mats. I think it’s silly to change mats since mud which can occur all year round isn’t much different than tracking in snow/dirt
I really like the weather tech all weather matts and would recommend them. They cover much more than OE and go up the sides a bit. Due to the gas pedal design in the Mazda, which I generally like, they can’t cover that are as well as you can’t go under it like in other cars where the pedal hangs down so that could still be an issue. I still feel like they do a better job there than factory though.
You don't use salt on your roads in Colorado. You have no idea what this does to your interior. Summer sand and mud is nothing compared to winter salt.
I prefer carpet in the summer. Man, there were SO many companies making aftermarket "summers" for Saabs. No one seems to have any for Mazda.