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As you can see from my photo, I ride in a sun shirt most of the time. I wear a sport bra underneath, the armpit area is vented and I can roll the sleeves up & down and they snap in place. I am not racing, just riding. Love the breeze as I go downhill. I have several. I also always, always carry a bandana, When it is hot I get it soaking wet and tie it around my neck to help me keep cool. Stopping, taking off your helmet and soaking your head is excellent as well.
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I often find one of those neck bandanas with the beads that swell up in water is useful.
I presoak it, fold it into a plastic bag, freeze it and then tuck it into a jersey pocket and break it out when needed. It is usually thawed out but still cool.
I also carry two bottles, one with electrolyte and the other with plain water so that if I get hot I can pour some over my head as needed.
I also always ride in a wicking cooler underlayer along with desoto arm coolers through most of the hot humid houston summer.
marni