Sleep more peacefully and soundly with the ISOCOOL Side Sleeper Pillow featuring Serene Foam. Its 300-thread-count 100% cotton cover is enhanced with Outlast Adaptive Comfort material, which self-adjusts to your body’s changing temperature and helps lead you to a more peaceful night’s sleep. Filled with 100% Serene foam in a plush gusseted design, the Supportive Air Technology increases support while reducing pressure. Serene foam is not temperature-sensitive, helping you stay comfortable throughout the night. This pillow also features Active Air Technology for increased airflow. Ideal for side sleepers. Removable cover is machine-washable for easy care.Serene is a registered trademark of Carpenter Co.; ISOCOOL, Supportive Air Technology, Active Air Technology and IsoFresh are trademarks of Carpenter Co.; CertiPUR-US is a registered certification mark of Alliance for Flexible Polyurethane Foam, Inc.; Outlast and Adaptive Comfort are registered trademarks of Outlast Technologies Inc.