Arterial cooling questions
I like this approach a lot. One of my hobbies is racing vintage cars, and I do that in hot weather in a fire suit. I have a Cool Shirt that I wear sometimes, but it's certainly not portable, I have to plug it in to a cooler that circulates water through tubes in the shirt. I understand what you mean about wasting cooling--the outside of my firesuit is cool to the touch when it's operating. It lasts for most of a race, but sometimes the pump looses prime and it cuts off prematurely.
I've also tried the phase-change shirt that has a white, waxy looking substance in pockets. It works too, but it's very cold to put on and doesn't last a full race. It's also not very comfortable and you have to take the whole thing off to recharge it.
I looked at your website for QorePerformance. Here are my thoughts:
I see the garmet is both sleeves and shorts. If the inserts can be recharged by putting them in a cooler, could the cooler be an insulated bag worn on the waist so it could be reached by the wearer?
I've never worn a PPE, but they look clumsy. Is it feasible to manipulate the inserts through a PPE? Could you perhaps make the pockets looser to make replacement easier and run a tab of Velcro across the pocket to tension it against the pulse point after replacement.
If blue ice and a well-insulated cooler is sufficient to recharge the packets, do you have any idea how many charges you might get with a comfortably carried waist cooler? I'm thinking it shouldn't be more weight than a typical camelback--say equivalent to a quart of water--about two pounds.
I think this looks promising from an efficiency standpoint. I'm going to order your shorts and armband to try under my firesuit anyway. You call the current approach a beta. I see you have a shopping cart on your site but the ordering details are confusing. Are they currently avaialable?