These three-layer insoles start with sheepskin on top, memory foam mid-soles in the middle, and Texon board on the bottom for extra insulation from cold hard floors. These are the same inserts we use in our Vibram Classic. You can easily put these inside an old pair of slippers or a pair of boots. These can be cut to a special shape with ordinary scissors or a utility knife. They come in full sizes (ladies 5 through men’s 14).