The sofa is already a necessary furniture for many families. There are three types of sofas on the market: low-back sofas, high-back sofas and ordinary sofas in between. The following describes three characteristics for consumers to choose to buy. Low-back sofa: a light chair that rests. It supports the user's waist (lumbar vertebrae) with a support point. This type of sofa has a low backrest, generally about 370 mm from the seat surface, and the angle of the backrest is also small, which is not only conducive to rest, but also makes the entire sofa peripheral size corresponding Zoom out. This type of sofa is more convenient and lighter to move, and has a smaller footprint. High-back sofa: also known as aviation seats.