WHAT MATERIALS & HOW CARE: 100% skin-friendly breathable Cotton fabric + High-quality buckwheat hulls filled. Handmade, ergonomic design. Buckwheat hulls are hard, which helps air circulate under the neck and promotes more cool sleep. Can relieve your sleeping problems, make you enjoy the wonderful night. Do not wash hulls. Pillow cases can be washed and then air dried. HOW TO USE: Our neck roll pillows have an hidden zipper in the buckwheat pillow insert, it allows you to adjust the height and the firmness of the cervical pillow. You might need to add or remove some hulls to find your ideal feel, the more hulls you remove the softer and more shapeable. WHO NEED IT: Our buckwheat pillows are designed with the utmost comfort, durability, and versatility in mind. Perfect for back, stomach and side sleepers. 16x4 InchWhether your napping at home or in office our buckwheat hull pillow supports your neck and head in a position, make you more comfortable, more relax. WHERE TO PAIN RELIEF: The cylinder pillow great for reducing pain sleep problems to provide neck and shoulder pain, muscle pain, stiff neck, headache, stress and tension at night. Very suitable for neck roll pillow, knee pillow, leg pillow, lumbar pillow, foot pillow. Between ankles, between legs, under knees, lower back and head, neck support.