According to the scientific principle, Landi water mattress takes full advantage of the natural characteristic of water's being all-pervasive. The logical design completely accords with human being's curve, which allow one's cervical vertebra, and ankle not to hang in the air any more. The support from the buoyancy of water can help the every part of one's body to receive the weight equably and comfortably. There will not be any sway or any wave crest and trough phenomenon . No matter you are tall or short, fat or slim, it is sure that you will feel good to sleep on water mattress.