Hot N Cold Science Of Sleep Custom Therapeutic Pillow  for neck support. Provides hot or cold therapy relief for headaches, neck aches, joint pain, soreness or muscle stiffness in the upper back, shoulders and neck. Reduces Head, Neck, Shoulders, & Back Discomfort. The cervical roll with it's gel core correctly positions the neck, aligns the spine keeping the head, neck, shoulder, and back muscles relaxed comfortable supported and free from muscle tension and stress. Maintains Correct & Comfortable Sleeping Posture. The Gelly Roll™ custom molds to support and position the neck in it's natural cervical curve while the head is cradled in comfort by luxurious polyester fiber. Designed With Firm Ends, A Soft Center & A Moldable Core. The firm ends of the Gelly Roll™ positions the head and neck and the gel core molds to provide custom support to the neck for correct sleeping posture and maximum comfort. Designed For Easy Use And Care. Manufactured with soft slickened polyester fiber, a vinyl gel cushion core and a zippered polycotton cover. See instructions for care and washing on the back.