Our premier mattress protector was designed with our own mattress systems in mind and made using 100% organic cotton.  This plush, stretchy, breathable, washable cover adds a layer of protection to your Design Sleep mattress without sacrificing the dynamic support, minimal surface tension, and temperature regulating air flow that make our mattresses great.  When it comes to protectors and sheets, using only stretchy or loose-fitting, breathable materials is essential to getting the most out of your Design Sleep mattress.