This warm-weather version of our best-selling Sasawashi Room Boot features a wool surface to keep your feet warm in the winter months. The interior lining features technical Sasawashi fabric, which blends washi paper threads with naturally antibacterial kumazasa extract to absorb moisture and odors. Room Shoe Sizing Tips: Please use the sizing chart, noting that - in addition to the US sizes - foot measurements can be taken in centimeters and compared to the Japanese sizes, which are also in centimeters. If you fall between sizes or have particularly wide feet, round up to the next size. Materials: Exterior: 67% wool, 28% polyester, 3% nylon, 2% acrylic Inner: Sasawashi fabric Sole: Polyester Dimensions: Medium: Approx. 9" L x 3 ½" W Large: Approx. 10" L x 3 ½" W Care: These room boots feature a soft sole and are intended to be worn inside. Don't wear outdoors or on cement. Machine wash in a garment bag with like colors.