The inside heel came out of my Solovairs (Docs) and I am unsure the best way to secure it inside my boot again.
For the most part it is not a big deal, but it does get annoying when it slides out under my foot.
I thought maybe shoe goo, but I think that may be too permanent (and messy).
I’d use the shoegoo.
decent (sort of thick gel type) double sided tape might hold for (guess) a few thousand steps.