I was so impressed with the two pair I had bought, I bought another pair just a little bit smaller, for my third hole. the rubber acts as a shock absorber . love the color for summer as well I imagine it gets super hot in the summer, on top of a black SUV, but ours worked as it should. I am going to order another pair. Excellent sound performance. 5 hours longer than the apple airpods. The soles are thick enough to insulate from hot and irregular surfaces, and yet are also very flexible and cushiony. Normally Id have my husband make one of these at home, but he didnt have time to- so I ordered it on Amazon. Going to research my old Keens once again and make sure there isnt a direct replacement from them, if not Ill probably look elsewhere for my work shoes.