A water-based pillow is not simply a pillow that's filled with water. Rather, in addition to having a water pouch which is secured at the bottom, the pillow has a polyester fiber layer that floats over the top. In this sense, the pillow could more accurately be called a water / fiber hybrid pillow.
One of the most important things to know about water-based pillows is that they have been shown in several credible studies, including a published clinical study conducted at Johns Hopkins School of Medicine, to reduce pain and improve quality of sleep.
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