This is the bedding made from a patented technology clinically proven to increase blood flow. The sheet's silky sateen fibers are interwoven with strands of Celliant, a thermo-reactive mineral matrix that converts released body heat into therapeutic infrared light that is reabsorbed back into the skin. Studies conducted by Loyola University Medical Center, the University of California Medical Center, and an independent Houston-based research firm showed that the safe, invisible infrared energy generated by the fabric in sock, glove, and shirt form temporarily promoted increased local blood flow. Optimized blood flow?in addition to helping regulate body temperature?has been a reliable method for decades to help increase comfort and promote a better night?s rest. Made with long-staple cotton fibers and treated with antimicrobial silver chloride protection. The Celliant will not wash out or diminish with wear. Grey or Ivory.