Cooling towel or similar suggestions?

I have issues with temperature regulation. Planning to go to an outdoor event in the summer. I have breathable pants, a sun shirt and a sun hat yet I know that might not be enough. I still struggled in the mid 80’s in the sun recently despite all this and breaks in an air conditioned car. Planning to hydrate and bring my electrolyte powder mix to put into my water bottle when needed, but want something more since air conditioning seems to be the best way to relive my symptoms.

Anyone have a cooling towel or similar you’d recommend?