Rubber Non Skid Gripper Bottom. Unisex. Leaves no marks on floor. Comfortable to wear. Designed for swollen legs diabetes wide feet Edema and circulatory problems. Sock Size 9-11 shoe size 7-10 Mens shoe size 8-12 Womens Tube like sock, Length of sock is 16" Unstretched Machine Wash Warm, Tumble Dry Medium. 80% cotton 12% polyester 8% spandex