at lunchtime, I walk around the city via sidewalks. When I’m finished with my walk, my feet are very hot and turn red. One day, on the weekend, I was walking around a park in grass and dirt and I noticed that my feet did not turn red and were not very hot. There seems to be a connection between the surface I am walking on and the temperature and color of my feet. Is there a type of shoe or insole that would keep my feet from getting so hot and red when I walk on a hard surface like concrete or asphalt?