Our Pillows core are filled with buckwheat hulls , they are organically grown in the United States, using no fertilizers or pesticides. This natural filling has many advantages over conventional fiberfill, foam, or feather fillings. The most important quality for the relief of pain is that the material conforms to the exact contours of the body providing a compliant passive support. This means that you have the same amount of support in all areas minimizing the stress on all areas of support. Other filling materials which compress, try to recover their original shape, and this puts stress on the muscles. Other advantages of the buckwheat hull filling are the "cool in the summer, warm in the winter" insulating properties, and the filling also lasts for many years. Long after other fillings have collapsed and worn out, a buckwheat hull filling will still be fully functional. Buckwheat hull is also environmentally friendly. We protect the core of our pillows with an ITY fabric which stands for Interlock Twist Yarn and is a method of putting a twist in yarn used for knit fabrics which gives the fabric some wonderful characteristics. The result is more natural elasticity and soft feel inside and out. Wanting only the best for our costumers we also include a pillows case made of a fabric called Minky dot . It is the softest and most cuddly fabric. It has a smooth Minky surface with dimple-like embossing . It is as durable as it is soft. Wash after wash, this fabric holds up and stays looking as soft and fresh as the first day you used it. We recommend washing your pillow case on a cold cycle and let it air dry. Ironing is not recommend as the heat will destroy the raised dots on the fabric.