

Great post Ann. People don't understand the laws of Thermodynamics. Heat will always try to find a balance and transfer from the warmer surface to the cooler surface. If it is over 99 degrees outside, you want to keep your 98.6 inside and away from the 102 outside. You will remain cooler by zipping up all vents and even closing the vents on your helmet. Keep the 98.6 inside and you will be cooler. I tested this coming home from Valcourt. Drove 200 miles across South Dakota in 102 degrees. I closed up everything and remained cool throughout. Once you jump out there in your shorts you will dehydrate and go into heat sickness very fast. So if you are going to the grocery store you can wear what you want, but for me, I am going to remain covered like those cool, calm collected BMW ryders.....and the long, tall cool one....Ann Myers!
I'd sure like to pursue this topic a little more. My wife and I took a ride yesterday in 96 degree weather. She was wearing her First Gear Hypertex jacket and I was wearing my mid-weight Olympia jacket with the pocket vents open. We both have HJC IS MAX-II modular helmets with the vents open. I was pretty warm but not dangerously uncomfortable but Jane was miserably hot.
So, I'm looking into this again, because living in Utah, hot weather riding is a reality and for safety sake if nothing else it's important that we not get overheated when riding.
So, vents open or closed?
Dedicated hot-weather mesh jackets or not?
High tech evaporative vests with built-in water supply worth the money and bulk?
Thanks.