Sofas can be categorized by function into functional sofas, fixed-back sofas, infinitely adjustable sofas, pneumatic sofas (i.e., manual sofas), electric sofas, and sofas with built-in TVs.
Sofas are now essential furniture in many homes. Sofas sold on the market generally fall into three categories: low-back sofas, high-back sofas, and ordinary sofas that fall between the two. Below is a description of the characteristics of each type to help consumers choose the right one.
Low-back sofas: These are lightweight, relaxing chairs. They support the user's lower back (lumbar spine) with a single support point. The backrest height is relatively low, generally around 370 mm from the seat, and the backrest angle is also smaller. This not only promotes rest but also reduces the overall size of the sofa. These sofas are easy to move, lightweight, and take up little space.
High-back sofas: Also known as airline-style seats. They are characterized by three support points, allowing the user's lower back, shoulders, and back of the head to simultaneously rest on the curved backrest. These three support points do not form a straight line in space, making the manufacture of this type of sofa technically demanding and the selection process more challenging.
Standard sofa: This is a common type of sofa used in homes. Most sofas sold on the market are of this type. It has two support points to support the user's lumbar and thoracic vertebrae, achieving a curve that conforms to the body's back.
