Buckwheat hull pillows have a cooling effect on the body as air easily passes through the hulls. Should you perspire, simply turn your pillow over. Our Cumberland Perfect Sleep Buckwheat Hull Pillows ticking is made of 100% cotton or 100% bamboo, and so too should the pillow slip you use on your pillow. This allows for the best possible air-flow between the hulls. Our buckwheat hull pillows are made here at The Joggins Fossil Cliffs with natural fibres like cotton and bamboo are always preferable for sleeping comfort.