This Avenco 10-inch medium-firm mattress is ergonomically divided into 5 zones to achieve ideal body adaptation and support. It can provide support from head to toe, no matter what direction you are lying in. With well-designed soft shoulder support and firm support for the hips and lower back, the spine can maintain a natural line to achieve optimal sleep comfort. Each spring of mattress is individually packaged, so each spring can work independently without worrying about collapse.