Originally Posted by
manapua_man
What kind of crappy helmets are you talking about? Anything decent made in the past 10 years or so is pretty light unless it's a full face deal meant for downhill racing. The MTB helmet w/ visor I use these days is a heck of a lot more comfortable in hot weather than any of the hats I've tried, purely due to the better ventilation it gives when moving whenever humidity is really high.
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I have a Bell Piston, a Bell Solaris and had some trek helmet that 'got lost' on this tour as I just didn't use it.
The thing about hats vs helmets in hot weather is that you can dunk your head in water, then dunk the hat in water and when both get dry, repeat. Much nicer than ventilation that's still goin to be inferior to having no hat at all or a wet hat.