A: Thanks for your question, Dee. Yes, the product's adhesive works with a wide variety of materials including leather!
A: Yes, it works on a variety of materials, including surfaces found in sneakers. The adhesive on the back of the insert is permanent. Please make sure to apply pressure to ensure product has a strong hold. Thank you!
A: Hi there, thank you for asking! Unfortunately if you do not use the adhesive we cannot guarantee that the cushion would stay in place. Most likely, it would slip out of the shoe without being adhered during use.