Great to see another barefooter here. I've been barefoot for years now. But just like you said, it's a challenge to walk on asphalt / bitumen roads in peak summer afternoons and on marble flooring in winters. I avoid walking during peak weathers as much as possible. But unfortunately, the biggest challenge these days is to find natural land to walk on. Everything in my city is covered either by asphalt roads or concrete side-walks. No place to feel the mother earth :(