A co-worker who rides with her husband on their GW gave me one of her cooling vests because she was buying a new one (we live in Texas - it's 103 right now!). I don't know what brand it is right this minut but it is real thin and zips up in the front - you can wear under your jacket or over a t-shirt. It has some kind of gel built into the fabric wherein you dip it in cold water and it keeps cold but doesn't really make you wet. At her suggestion, I wet it, wrung it out and put it in the freezer and it stayed cold for a long time when I put it on! Here in the South we don't put our bikes/trikes up for the winter, we usually put them up in July and August and bring them out to ride in the fall, winter, spring and early summer. But July and August is almost unbearable where i live. Good luck finding one they are good to use!