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If the waders are full of air and Your upper body is heavier than the lower 1/2 would that make You float feet up.
If you wear your waders fishing, and do any amount of moving around you are going to sweat like a pig...been there done that...last ice sometimes we need waders to get on, once we are on good ice, the best thing to do is take them off...just a little bit of moving around, drilling holes etc, makes you sweat like all hell...