PopGrips stick to most materials, the best example of which include smooth hard cases.
There are, however, a few exceptions. Our adhesive will NOT stick to iPhone 11 Pro or iPhone 11 Pro Max models without a suitable case.
Additionally, cases made from silicone, leather, and other soft material may not bond well with our gel. The good news, on the other hand, is that we just introduced the PopSockets Slide which is designed to work with Apple silicone cases. You can get started here: https://www.popsockets.com/search?lang=en_US?q=slide