Water Pillow by Mediflow: The first and original water pillow, clinically proven to reduce neck pain and improve sleep. Therapeutic, ideal for those who suffer from sleep trouble and whiplash CLINICALLY PROVEN: Our Waterbase technology has been clinically proven by an independent Johns Hopkins study to reduce neck pain and improve overall quality of sleep, bringing you the best night's sleep you have ever experienced IDEAL FOR ALL SLEEPING POSITIONS: -If you are a side, back or stomach sleeper or switch in between - the water will move with your head, so you will never have to adjust or fluff this pillow. CUSTOMIZE TO YOUR COMFORT: Our Waterbased Pillow can be customized to your liking! Adjust the water level for make your pillow soft, medium, firm or even medium-firm! SUPERIOR MATERIAL: This pillow is made with a fully sealed and insulated water pouch with resilient Dacron Hollofil fiber layer on top, encased in a 100% hypoallergenic cotton shell, providing exceptional comfort for the head. MADE IN THE USA: We stand by our product with a 30-Day Satisfaction Guarantee & 3 Year Warranty over manufacturing errors  if you aren't happy within 30 days, well take it back, no questions asked. With the Mediflow Waterbase pillow you get the soft comfort needed to achieve sleep quickly and the customizable support from the waterbase to maintain support to reduce sleep interruptions. The waterbase adjusts automatically as you move during sleep!