Hello! On my opinion the best cooling vest is FlexiFreeze Ice Vest. Why? I use it allready when ride on my bike and it's help good as for me and coasts more then other one. Before this i used another one (forgot the name of it), it helps too, but this one is better. So i chose the FlexiFreeze Ice vest.
https://gadgets-reviews.com/review/224-how-to-pick-a-proper-cooling-vest.html