I use the cooling scarves. Wal Mart sells them in the sporting goods department. Lots of patterns and prints available.
Soak them well, store in fridge and off you go.
If we are going to be outside for long periods, I keep them in a cooler with frozen water bottles . This seems to have worked for me.
Stay hydrated, drink lots of water. Misting fans also help.
In a pinch, using something cool on the back of your neck , wrists and elbows, i.e. damp paper towels from the ladies room
I want want winter to end but I am dreading the humidity of summer!!
Good luck in your search