Nearly everybody has used the water-absorbing neck wraps, right?  You soak them in water and then wear them to keep you cool for a while.

This Hyperkewl vest includes the same water absorbing material and will keep you air conditioned for a good long while.  Wear it under a mesh jacket for a cool, but not soggy ride.

Years ago, I used to fill my jacket pockets with ice at the 7-11 to keep cool in really hot water.  It worked, but what a mess!  This works much better.                                                  

Available in Small thru XXXL,