PolarPure™ Fitted Mattress and Pillow Cover combines an innovative temperature cooling finish with moisture protection to help you get the perfect night's sleep and extend the life of your mattress. The top fabric is a new cooling technology utilizing a waterproof woven blend which not only keeps you comfortable with a luxurious silky like feel, but also protects your valuable mattress from spills and accidents. Stretch knit sidewalls provide a snug fit and are great for memory foam or traditional mattresses.