NWOT #1023816 rubber sole made with an environmentally preferred, premium, soft leather and textile upper from tanneries certified by lwf support & comfort: removable keen.crush pu and memory foam footbed for ultimate underfoot comfort; a ultra-soft microfleece lining offers comfort and warmth in colder environments traction: non-marking rubber outsoles leaves no trace or imprints while indoor; this rubber outsole makes this slipper great to be worn both indoors and outdoors