PP Graphene X Nasa Mattress Topper (King)PP Graphene (PP Shm x) Medical Grade Comforter, trusted by NASA astronauts for space travel! Did you know that good sleep is essential for a healthy immune system? Sleep deprivation can have widespread health effects, which is why we've designed our comforter to ensure you get the best rest possible. Crafted with superconducting fabric, our medical grade mattress enhances the performance of far infrared rays, promoting deep sleep and improving sleep