Cooler days out here in Southern California it's Sperry Topsider deck boots, with my pant legs tucked in. When the fishing is good there's a lot of blood on the decks, and the crew washes down the deck frequently. Wet tennis shoes - not good!
Summer I have a pair of crocks (cheap knock off's actually (Big5), but....) They have good grip on the soles, good grip inside the soles, so your feet don't slide around inside of them if they get fish slimy or bloody. The water runs right out so you're not standing in water all day. And it's a little better coverage. Lots of people on some of the party boats, hooks on the floor, fish flopping around,... I don't like my little toes out there exposed in sandles...
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