Paris. let's say you walk around barefoot all day..picking up every peice of dirt, bacteria, germ that happens to stick to your already sweaty foot! then you come home tired get into your bed and stick those same feet into your sheets..i just picture the bacteria swimming pool that is happening under my sheets! for almost 5 yrs i was phobic about putting my feet into my sheets so i would sleep on top of my covers with just 2 throw blankets for warmth..and you still want a foot to touch you? LOL i might be dramatic but it's my little tick that i can't shake.