Mule shoes are a type of shoe that has no back or constraint around the foots heel, and about two-thirds of a mule is covered in softer materials, while the back remains free. They started out as bedroom slippers and were not popularly worn until the 16th century in Europe). Mules were worn with dressing gowns and typically matched the loose outfits by having the same comfort). The early mules did not have any distinguishable features). Mules have a wide range of styles, but the one constant is that they are backless and slip-on. Some mules have open toes, while others have closed toes, and they can have high heels or no heels at all. Mules can be worn with virtually any style or outfit in your wardrobe, which is one factor that has caused them to begin trending again. They are comfortable, stylish, and good for your feet. Mules are popular with women for an assortment of reasons, including convenience, as they are easy to slide on and off. Mules can be worn to work, to the mall, and to a rock concert.