Ergodyne Premium Unisex Cooling Vest - Breathable & Evaporative for Hot Weather - Sizes XXX-Large & 3X-Large US - Ideal for Construction, Landscaping & Outdoor Work

Some context: I've already used the vest three times, each time at 100°+ with humidity of roughly 9% - Phoenix in summer is absolutely ideal for an evaporative cooling vest. I've owned a wet evaporative cooling vest (use it on my motorcycle) for years but was hoping to get something easier to use. I work outside and didn't want to have to haul a water source around with me for refreshes. In that sense it's convenient: I activate it using 3/4 of a personal-size water bottle. I can do that at home and it lasts for the 4 hours that I need it to. [I suspect that the "up to three days" is a stretch]. The only challenge, and I suspect I'm just low on the learning curve, is working the water evenly around the vest - specifically making the water migrate from the back to the front. That said, I seem to manage to get the water where it needs to be. I've washed it between each use, delicate cycle, and it comes out of the washer just fine. The sizing runs just a little small (one size at most), but not as much as others have mentioned. Overall, a great product, but I wouldn't recommend if your humidity exceeds 50°.