They stay and don't damage!
They fit wonderfully!  I bought these for my wedding and I used one set and a bridesmaid used another.  The smallest size is for the skinniest stiletto possible.  The medium size is for a normal stiletto.  The largest size is fairly wide for a wider heel.  I wore glittery Betsey Johnson heels, and the soft silicone did not damage any of the sequins or glitter around the heel base.  They protected my shoes from the gravel walkway and STAYED ON.  No issues whatsoever.  Loved them and would recommend.  If you're going off concrete, for sure, invest in a pair.  If you're walking a whole lot and want to maintain your heel (you know how walking sometimes causes uneven wear in heels and the have to be re-soled), then these will protect your shoes.
Rating: 5 stars