Cotton Newly Material The newly silk jersey pregnancy pillow cover is extra cooling and machine washable. No more sweat at night! Both the outer and inner body pillow cover come with double zippers which allow you to adjust the filling to reach your own height. The soft filling is 7D polyester which is carefully picked and selected by hand. It is supportive and retains fluffiness for better performance and longer use. The material is soft, no harsh smelly on the super sensitive skin. Make You Feel Safe and Lower Your Anxiety Through our tens of thousands of experiments, we found that you will feel safe and your anxiety lowers because your back feels protected.