Hokay: When feet are uncovered, you are "barefoot" (ONE word; it's an adjective) When you go with uncovered feet, you go "barefoot" (ONE word; the word becomes an adverb) When feet are uncovered, you have two "bare feet" (TWO words; bare is an adjective, feet is a noun)
Don't you guys know? Feet are just some stuff you put inside of your shoes. Otherwise, they are expendable. Shoes are the valuable item.