Thanks fred, that's a good thought, especially since my feet are on the wide side anyway.
What I'm really after is a way to protect the neoprene footer from excessive wear; I just wear a sock liner when winter fishing. Last two waders I had both developed small leaks in the footer over time, too small to locate and fix, but just enough to cause dampness after awhile. My thought is that the leak was from wear against the inside of the boot. I would periodically seal the whole outside seam, and that would take care of it for a few more outings, then it would need to be done again.
Doesn't Simm make a wide boot?
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