I think this is one of their main advantages. The vinyl covering is "sticky" and they resist sliding. Sometimes you have to kind of peel them up actually. They do take a lot of room if you try to store them somewhere, we leave them in place anytime we are on the boat. I do stand them up on edge overnight to let everything dry. I have been on boats that have cushions with fabric or mesh bottoms, and they are pretty treacherous with any heel on.