A quick scan shows this product has been talked about before but for any newcomers here is my $.02 worth. Riding today in moderately hot (for us) 96 degree weather I broke out the vest with about two hours left in my 380 mile ride. When before it had been bordering on miserable the vest, while certainly not AC, made the rest of the ride pretty darn nice. Very much worth the money to me. And after the two hours I would guess that maybe 40% of the water (based on weight of the vest) was still contained in the vest. So I could have gone even longer without having to rewet it. Admittedly I live in a dry climate (35% today, high for us) so maybe the vest would not work in a humid climate. Anyway when a product works for me I like to let others know for whatever its worth. And the vest most assuredly works here.