What is the size of the Chiroflow® Professional Waterbase® pillow? August 06, 2019 14:49 The Chiroflow® pillow is a "Jumbo" size - it is 20" x 28" and will fit a standard or queen pillow case. Related articles Is my pillow hypoallergenic? How long can the water stay in my pillow before it needs to be changed? Which side of the pillow do I sleep on? Chiroflow's Product Quality Assurance: How do I fill my pillow?