Like Bobbyg said a pair of these will make any wading boot/shoe fit just fine when wet wading. I typically put a heavy wool sock on my foot followed by the Simms Guard Socks and then my wading shoe ALTHOUGH...
...when wading on, in or around mud, I prefer studded rubber or studded felt if that's all I got. Felt can get pretty slippery and the Kick Boat Booties have small felt patches, lots of exposed rubber and no cleats. If your regular wading shoes have studs I would just use those. They also will save you if there is any glass or other sharp stuff lying about.
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