Not very happy with this product, leaving marks on my floor, they are only visible if I bend down, because I made a trial and once I saw this stoped. Was hoping once I moped it will go away but it didn't. So in my opinion very bad design. And yes I used the soft side. In my opinion the soft side is not deep enough and once you apply the pressure of your body on it, the plastic can reach, just a guess. Not worth the money.