Must be inserted between shoe layer
No stickiness to these HARD vinyl layered heel lifts.  The only way to wear them is to remove the shoe lining and place them underneath.  They are hard, inflexible and will slide if just placed in the shoe.  I bought them because they were clear and I wanted to use them with sandals that have a sticky heel.  I am sure that these would be useful for some people, but not for me.  Into the trash!
Rating: 2 stars