Believing a good night sleep is essential to achieve good health, ancient Oriental doctors advocated for keeping the heads cool (old proverb cool-head warm feet). One solution is via the Sobakawa (Japanese for Buckwheat) pillows. With more reliable polymer products nowaday, modern pillows are designed to allow liquid coolant to cool. Simply fill the cool pillow liner with water. You will enjoy a soothing and relaxing good night sleep and wake up with rejuvenated health. Dimensions: 20x10x1.2 inches.