Wieland, I’m not interested but dropping in to say you might be a genius. Sled helmets on the boat when it’s cold, that’s a hell of an idea!
Would like to take credit, but I was handed a helmet by a friends dad back late 70’s. That was 30ish mph on water at 38 or so degrees. In 90’ I went to about 60mph in a bass boat at ice out. Huge difference in comfort putting the hammer down when water temp is only 35-39 degrees