Yep, I bought my wife the bandana version in Zion N.P. a couple of years ago during a heat wave.
They do absorb an amazing amount of moisture and they release it very slowly. They do feel very cool against the skin. The one downside is that they take time to absorb the water. They have to remain immersed for some time. The website says 10 minutes but I think it's more than that. When they do start to dry out you can't just dip them in a stream for a moment like a regular bandana. They have to soak in order to employ their full advantage over a plain bandana. And you'll need a container to dip them in. I would not drink water that they have been in contact with. The fabric is porous. But the good news is that they remain moist for a long time too.
Honestly, given the environment you'll be in and the shortage of water to hydrate these things, I'd personally go with a regular bandana. I'd rather drink the water. But they are great for car camping or areas where water is plentiful.
These work fine in lower humidity climates. Down here where the dewpoint in the summer hovers around 75° if you're lucky and the air is as still as death, they just make you even wetter and more miserable, unfortunately.
Loc: East Texas Piney Woods
CnB I'm not familiar with the brand you mention but we used Frogg Toggs Chilly Pad Towel this summer at camp and also on a trip to SE Oklahoma in August when it was 102F and these towels really helped. We dipped them in cold water and then just draped them around our necks. They really helped. http://www.chillypad.com/
I like the chilly pads and have used them before. And now that someone else mentioned the bandanas require soaking time to refill - I might just plan to stick with the chilly pads and regular bandanas instead of the extra cool bandanas.
I've had the same experience with Kool-ties. In Wyoming, while mountain biking, they were phenomenal. In Tennessee, with high humidity, they just weren't worth the weight (which was a good 5 or 6 ounces when the crystals were fully inflated).
I live in Oregon and where I'm at there's usually plenty of water... I keep one of those bandanas handy in case I want to use it, but I wear a cotton cap and dunk it in the creek. It doesn't last that long but it sure works well for me. That being said, I'm usually hiking up a creek or a river.
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