There is a drug store product that works well for me. If you can adjust to sticky menthol cream, put in behind the knees,back of neck, on wrists and inside of elbows. It is a product used for pain, but the menthol is cooling. Sometimes called freeze, therapain, ice cold,etc.. Also I've heard in hot states alot of people carry a spray bottle of water. To get a really small one, I buy body spray at the drug store and empty in,replace with water. Also I never leave home without my matching wet bandana in a ziplock bag, to wrap around my neck. Refreshen in any washroom.