When people choose a sofa, the first consideration is its comfort. Then its comfort is related to the softness and density of the sponge. According to different designs and requirements, sponges with different hardness are used in different parts of the sofa. For example, sofas emphasize delicate contours. If your lines are fluent, you will think. Rigid load-bearing sponges are used to shape the cushions, shoulders and handrails of sofas, which can help people rebound quickly after getting up. For example, a sofa emphasizes the comfort of the sofa, so soft or super-soft sponges are used in the cushions, shoulders of the sofa and armrests of the backrest to increase the warmth and comfort of the sofa. Different people have different needs and considerations for sofa functions.