Our Medisoft- Deluxe Quality Fabric is a polyester blend fabric with a membrane backing that looks and feels like satin. The polyurethane backing keeps dust mites and dander from surfacing on your mattress while sleeping allowing you to have a more restful sleep. This fabric can be washed as you would your bed linens. We also recommend using our Allersearch® Allergen Wash™: Super Surfactant Laundry Detergent 24oz.  for those who are sensitive to regular detegents.