Reversible refers to the ability that some garments or materials have to be worn or used with either side turned outwards. Reversible also refers to parts of an item that can be flipped over or changed of direction.
About Slides:
A backless, open-toed shoe that is generally a type of sandal. Slides can be high heeled, flat heeled, or somewhere inbetween; may cover nearly the entire foot from ankle to toe; or may have only one or two narrow straps.