They work fine for me driving with my PN. The soles are rubber with some non-slip surface. My biggest problem is not with the foot slipping off it's with large thick soles hanging or bumping the edges of the pedal when I apply the brakes.

David - At one point I actually found (and bought) these non-slip pedals or covers for my car. The added bonus was they had colors or accents that I felt would help me feel safer than the all black pedals on my car. (Granted, we shouldn’t be looking at our feet while driving, but it seemed to be a smart idea to be able to check foot position and feel every time you get in). It ends up that I bought the wrong size for my car model, and never pursued it further. I don’t recall from a couple of years ago if my husband would have been able to put them on or if I would have needed to take my car to a garage. I’m just throwing it out there if anyone else has tried something similar.