Hi, My name is Richard ( Rich) and would love to know how your vest is working, I grew up here in FL and now with POTS am Heat intolerant. I spent most of the spring, summer and fall up northwestern Maryland in the Mountains to avoid the heat. The times that I am in the heat, a cool vest sounds like it might help. The company that I looked into so far is the "Cool Vest" company. I share any info you have with your vest....i.e durration time in the heat Thanks, I love this Web-site, I know I'm Not crazy now Newbie, Rich