You can change the firmness by the amount of water added, just like a waterbed. Supports the Cervical spine ideally. Clinically proven to help naturally relieve neck pain caused by arthritis, stress or injuries. The water pillow is surrounded by an Extra Soft Layer of Polyester fill to make it perhaps the most comfortable pillow ever. Every person's anatomy is slightly different.
People have different preferences about the firmness of their pillow.
On average, there are 12 major body shifts and 50 movements in head and neck position during sleep. Allows you to personalize the level of support you want. Easy to follow instructions tell you how much water to add for soft, medium and firm support. Use ordinary tap water. Instantly Responds to changes in sleeping position.