18 sections adjustable: this sofa can be adjusted to 18 different positions. One position is sitting and the other is lying. You can adjust the position at will. The folding mattress sofa can not only be a sofa, but also a bed. Small packaging size, low final shipping cost Full sitting sensation, enlarged size, multifunctional and versatile use in multiple scenarios, adjustable back to meet various relaxation postures Increase the thickness of market products without increasing the price;