Keeping Cool...
 

If it hot where you are, then you should get something like this:

Kafka's Kool Tie at REI.com

They are awesome - the special polymer beads are less than a tablespoon when they are dry, but they swell up to fill the center portion of the neck tie, and they cool you quite well. Totally natural evaporative cooling that has virtually no carbon footprint.

I think that this is the greatest thing since sweat.

-AC