The OEM ones have Velcro on the bottom which are supposed to grab onto these plastic pads that go into the car's carpet. Works pretty well if the Velcro part of the mats haven't been ripped off by careless car wash attendants.
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2005 BMW 330i ZHP 6MT. Built 11-19-04. Bought 4-2012.
Stock: Nav, leather, PDC, Xenon
Added by me: OEM Alarm, OEM heated seats, OEM aux kit, OEM Bluetooth, intravee, M3 strut brace, BMW Performance Intake, Nappa leather arm rest, updated LCM (triple blink, euro hazards, trifecta lighting, 3 stage brakes), temp gauge