Easily shaped with a little shake then when pressure is applied the hulls lock together. Extremely durable typically outlasting other types of hull fillings.PILLOWGANIC's unique 3 chamber design hold its shape. Inspired by handmade pillows found in Buddhist temples of Thailand.Quality domestic manufacturing in Arizona by our sewing team in a “state of the art” sewing factory.Cotton fabric:We use tightly woven cotton fabric designed for pillows, this fabric type keeps the rice hull filling inside the pillow and keeps filling contents clean. This fabric is easily spot cleaned Rice Hull Filling: Rice Hull filling has many benefits to synthetic and other fillings. It feels great, keep its shape under pressure, it breaths and keeps you cooler. Its a non synthetic organic material and eco-freindly, can be added to garden soil at end of life.