I used my vest over the weekend to determine my ability to wear it in 'hotter' than average temperatures for me. As I expected my body core temp was higher but manageable under the circumstances. I intend to use it in a different environment in September and am certain it will pose no problems for me.
Superb unit. Excellent device. Fortunately I have not had the experience in testing it's reliability personally, however, I hope, and trust that it would protect, and perform as advertised. Very sturdy.
Quality materials and a real sharp look!