I've used the scarves filled with water absorbing crystals, and they work well.

My daughter was using a cooling scarf on a tour in 95+ F, and relatively high humidity. They do help, and stay moist for quite a while.


You might try MEC. You can also find them on Amazon. Amazon.ca

In the U.S. available at REI: REI

My wife had a scarf, but also used this method for a little more evaporation.