Faux fur inner and outer lining. The sole is called a Man Made Textile which is fancy for a very durable non-rubber sole, but has tread and they don’t have that ‘stiff’ step. Can be worn outdoors. Very comfortable; I keep a pair at work also! Brand new. TIP: Can be immediate relief after a long day or night on your pedicure’d feet….keep them in your vehicle. My daughter does it after her shifts! SIZE: 8 - true to size