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I suspect that they are refering to the water in the seat. There are brands that don't have a drain hole in the seat and and I'm sure wet. Most good brands have drainage There is some paddle drip, even with stops, but most pepole are wading anyway, at least I do. In cold weather I use neoprenes, they're warmer and offer a measure of safety, especially when used with a dry top.
If you really want to stay dry however, a bass boat would be the best choice, just don't go too fast. :lol: