The TruCool Hybrid Bed Pillow Featuring Serene Foam is designed with a serene foam core surrounded by a fiber-filled cover, providing optimal comfort and support. The removable cool-to-the-touch cover offers greater airflow for a soothing experience. Cover is antimicrobial treated serene foam features IsoFresh odor-neutralizing technology and is CertiPUR-US certified. TruCool and Serene are registered trademarks of Carpenter Co. Supportive Air Technology and IsoFresh are trademarks of Carpenter Co. CertiPUR-US is a registered certification mark of Alliance for Flexible Polyurethane Foam, Inc.