Using patented fabric developed for NASA to help keep astronauts cool in space, this is the pillow that provides a comfortably cool sleeping surface. Millions of invisible microcapsules inside the pillow shell absorb excess heat and move the warmth away from the head and neck, creating a cool sleeping surface throughout the night. The patented fabric covers both sides of the pillow and its cooling is effective under any pillowcase. The pillow is filled with a spiral-crimped polyester that has a loose, thread-like texture for long-lasting loft. The 100% cotton cover is hypoallergenic, removable, and washable.