This is a must have for anyone who is boating or fishing on a really hot
day.

http://www.kooltie.com/

from their web site.

The Original Kool Tie is an attractive fabric tubular scarf which
contains polymer crystals. When soaked in water, these crystals absorb
more than 400 times their original weight (see illustration).

The Original Kool Tie cools the body through the natural process of
evaporation and never needs to be refrigerated or frozen. This cooling
effect is continuous and will last for 2-3 days before a re-soaking is
needed. This provides a more efficient & comfortable method of dealing
with hot situations than products with frozen inserts. "Freeze & wear"
type products are useful only until they melt, usually about an hour. In
addition, the extreme coldness can actually create more
discomfort--remember the headaches you got as a child when you ate ice
cream too fast?

The cooling effect of the Original Kool Tie is all natural--you need
nothing to activate it except water. The gradual release of moisture
provides the cooling effect.


These would be very cheap to make, and there are less expensive knock
off around, but I have no idea of their quality or comfort, at $10 or $5
for the knock off, both are cheap.