My little guy has super thick feet. It is tricky to find shoes for him. I can find shoes that are long enough. I can find shoes that are wide enough, but often they are too short for the height/thickness of his feet, for instance, I can't find saltwater sandals that fit him.
Is this what you meant by "thick", OP?
I love his See Kai Run shoes! They are easy to get on and off and he likes them too. We got them months ago and he still calls them "new brown shoes" and asks to wear them specifically. They are a great transition from soft-soled moccassin type shoes to something a little sturdier. They are in no way water resistant, however.
::::: Married for ten years to my good man :. Mama to my sweet and funny boy and my lovely little girl