Tempur blankets contain the unique TEMPRAKON® technology, which is now complemented by another NASA space technology innovation: the FRESH method. The blanket automatically takes care of your ideal warmth by storing your body heat and returning it during the night. The FRESH method actively prevents the creation of moisture and microbes, keeping you fresh throughout the night. When night sweats and tossing and turning are reduced, you sleep even better. The cover is 100% cotton.