OUTLAST duvet, pillow and mattress protector collection is utilizing NASA’s patented Outlast Space Technology to regulate temperature and provide exceptional comfort. The thermocules trapping and releasing heat based on your body’s temperature needs help to create a more comfortable sleep environment. Additionally, the top-quality cotton batiste cover fabric adds to the overall luxurious experience. The filling consists of the excellent quality LuxFill fiber. It is a great product for maintaining a comfortable sleeping environment. It is made in Poland and meets EU highest safety and quality standards.