Chemical free Organic Barrier Covers help protectpillows from dust mites and prevents them from entering and laying their eggs in your bedding. Our barrier cloth is a high thread count SKAL certified organic cotton fabric that is then heat pressed to tighten the fibers to less than a 6 micron opening - recommended to protect
against dust mites debris. Our nylon zipper has tight teeth to keep the nasty bugs out (brass zippers have too much space in between the teeth). We do not contaminate our organic cotton by adding any chemicals or urethane.