Mediflow Waterbase Pillow Therapeutic cervical pillow with fillable water bladder. Provides outstanding comfort and support for the head and neck. Instantly adjusts to changes in sleep position. Reduces neck pain, relieves associated headaches, improves quality of sleep. Thermal insulator fully incases the water layer to prevent body heat from being drawn from the head, neck and shoulders. Super soft, hypoallergenic DuPont polyester fiber top layer. Fill with tap water. Personalize for soft, medium or firm support. 2-year warranty.