Angelie,
I think you said earlier that the ones you bought were 3mm thick, which is too thick for CL shoes.
The material I bought is 1.8mm thick but the manufacturers also do 1.0mm thick.
I thought that the 1.0mm would probably wear out much too fast so I checked with my local cobbler. He said that the 1.8mm would be fine, so that is why I purchased the sheet in that thickness.
Please post the results when you have them. We are all eager to learn the results. Thank you for sharing!