Mercedes-Benz CLA Owner's Manual page 130

Stow all objects in the vehicle securely
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so that they cannot get into the driver's
footwell.
Always fit the floor mats securely and
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as prescribed in order to ensure that
there is always sufficient room for the
pedals.
Do not use loose floor mats and do not
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place floor mats on top of one another.
To fit: slide the corresponding seat back‐
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wards and lay the floor mat in the footwell.
Press the studs 1 onto the holders 2.
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Adjust the corresponding seat.
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To remove: pull the floor mat off the holders
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2.
Remove the floor mat.
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Seats and stowing 127