Oh! It's like the Earth is a giant waterbed. When you lie down on it, the surface of the mattress under you sinks, forcing the water into other parts of the mattress.
The bed mattress of the utility model is a water-filled bed mattress which is warm in winter and cool in summer, and can be used in four seasons.
本实用新型提供的是一种冬暖夏凉的充水床垫，可四季使用。
3
The heat preserving cap is covered on the upper part of the dinnerware. The heating water bag and the heat insulating mattress are arranged between the dinnerware and the heat preserving plate.