Very sturdy. Large side walls.
These are some seriously stiff shoe inserts. I originally purchased them for support in a lesser quality day shoe for added comfort and support, however, the side walls are so tall the insert won't work for the shoes I planned. Instead I used these in my wellies and am pleased with the fit. In my opinion these will not work for any type of delicate or summer shoe. These are more of a workhorse insert. If that's your need then you will be pleased.
Rating: 4 stars