Heat-retaining cotton & aluminum sheet & 4-layer construction Size: 40 x 30 x 13 cm Color: Beige (Price includes shipping of 850 yen via Rakuraku Mercari.) Flannel is used for the entire bed, including the sides and corners. The fine fibers are densely packed, so it's fluffy, soft, and smooth to the touch wherever you touch it. Four-layer construction: Contact heat-sensitive flannel + "Easywarm" heat-retaining cotton + insulating hollow fiber cotton + insulating aluminum sheet + non-slip fabric! The bottom is designed with improved non-slip properties, making it difficult to slip and allowing you to relax with peace of mind. The fluffy, three-dimensional pillow makes it easy to rest your head and chin, and you can lean against it or relax comfortably. This is a product I've used before, and it's washable, so I recommend it. Thank you.