The term 'Comfortable Shoe' can be broken down into two crossword solutions: 'FLAT' (4 letters) and 'LOAFER' (6 letters). A FLAT is a type of shoe that has no heel or arch support, making it a comfortable choice for everyday wear. Loafers are slip-on shoes that have a low heel and a moccasin-style upper. They are often made of leather and are considered to be a more formal style of shoe than flats. Both flats and loafers are popular choices for those looking for a comfortable shoe.