i used a cooling bandana last september in wdw - you soak it in water (about 20 minutes) & it expands - it does seem to cool your neck a bit - as it dries & evaporates, you re-soak it - it takes up to a week to actually dry out completely (where it's back to being a flat bandana filled with those crystals)
We bought some for our trip last September but only used them very briefly on the first day. We didn't think they worked very well ... and, personally, I didn't like the feel of the wet, sweaty band on my neck. Blech.
My 11 yo DS used one on our trip in early July. He used it almost the whole trip as it seemed to help him tolerate the heat better than on other trips we've had, and this was our first WDW trip in the middle of summer.
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