Thanks SO much for this info. Just ordered one. Only wish I'd done so 3 months ago!I run with the mesh jacket and a vest from Colorado Coolwear. It's lower tech than a lot of the other "cool" products but its also about 1/2 the price and lasts 6-8 hrs and re-charges in 5 minutes. Road all over southern Utah last summer in temps over 105 and it was like airconditioning
Evaporative cooling vest is the way to go. Through summer here we regularly ride in 95F+ weather with high humidity. Ours are from here: http://www.coolingapparel.com/ and follow the link to Cooling Vests. These are really excellent, and one of the first things packed for any trip, any time. In cooler weather they can be used as a great warming waistcoat too.