Wetsuits work with water to keep you warm with a thin layer of water that doesn’t move between the neoprene and your skin.
I’ve sat on frozen lakes in a 7mm with farmer John two piece and stayed ok.
Keep in mind if you sweat you stay wet. The wetsuit boots once wet can stay REALLY cold if you sweat. When ice diving my boots freeze solid and we stand in a bucket of hot water to keep warm and get the boots off.
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