Lian UniCased all-round stable protection structure provides comprehensive comfort and support, increases the actual use area of the mattress, and effectively reduces the interference between sleeping partners. The structure consists of two parts: the edge of compression spring and the bottom plate of cushion. The edge of the compression spring is a durable panel that has been specially molded with plastic. The inner spring is embedded and locked to ensure the edge support and overall stability. The cushion bottom plate is a unique groove structure, which surrounds the whole mattress. These two parts are joined together by thermal welding, thus stably protecting the mattress in all directions.