For any of you guy's that live in hot climates I can highly recomend one of these
http://s351.photobucket.com/albums/q...entials006.jpg
http://s351.photobucket.com/albums/q...entials004.jpg
http://s351.photobucket.com/albums/q...entials010.jpg
It's a vest with polymer beads inside that swell when soaked in water
Worn under a vented jacket it is nice & cool
The one on the desk is a neck wrap for good measure