Made of ultimate comfort premium quality polyester lining and acrylic outer knit pattern or design; Mens size scale: Small (Shoe Size 8-9), Mens Medium (Shoe Size 10-11), Mens Large (Shoe Size 12-13); Non slip gripper bottoms make these perfect indoor slipper socks for use on hardwood, tile and other smooth floors; Machine wash cold or hand wash, air/hang dry; Enjoy lounging in these excellent value soft slippers in the home, office, dorm room or as a gift for a friend or loved one!