I've never used this, but looked like a good deal on a cooling vest. I've bought from this company before, and had was very satisfied with their service. Might be worth checking out if your looking to get a cooling vest.

Techniche Evaporative Cooling Vest - Standard Hi Vis Lime - PalmFlex Inc.

Also, for you cold weather fishermen and duck hunters, they occasionally have good deals on Atlas 460 cold weather gloves, like the ones crab fishermen wear. They are the best waterproof gloves I've found, and MUCH better than neoprene for picking up decoys or fishing in general. Pretty good dexterity too.