I purchased black WT digital fit liners for my 2009 X5. I live in New England and drive around to customer sites all day. After a few days there is a nice collection of dirt, sand, rocks, leaves, etc. . . that would otherwise be ground into the carpet. It is easy to lift the liners out and dump them.

Once you remove the liner you find some stuff falls around and behind the gas pedal. I just use a brush to collect up all the little bits of stuff and swish it out the door.

I occasionally wipe them out with a damp rag and spritz some 303 Aerospace Protectant, they look new again.

The rear seat set fits well under the seats and covers the hump too.

I bought the WT version at stratsautoextras.com before I knew about the BMW logos are available at bmw.dealerfit.com