I got this friend that really doesn't like to be barefoot, this one time, we were all hanging out in the pool and she was with her sneakers. Why do they feel uncomfortable or exposed its part of the human body!
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I notice that sometimes after I shave off some of the calluses on my feet, it hurts a bit more to walk around barefoot. That's because the thick layers of dead skin (callus) that forms on the bottom of your feet acts sort of like a shoe does by protecting your feet (but obviously not as well). If you never walked around barefoot then your feet never built up a natural protection.
I'm not an expert but I googled "callus barefoot" (can't add links yet but it's the first one I got)
What one person had to say about running barefoot -"the fat pads on the balls and heels of your feet get thicker and the skin gets a nice leathery feel" which obviously your feet don't feel the need to do if you are wearing shoes all the time anyway. Also apparently when people who have never run barefoot do it, most of them notice that the front of their foot gets wider (because they aren't being constricted in a shoe anymore) and they get more prominent arches.0