According to ergonomic researches and analysis : while sitting in an office chair the back and lumbar require multiple ways

and degrees of support since posture keep changing while we are sitting …

Under this challenging requirements the simple and smartest solutions is the  Swan plus office chair.
The ergonomic chair design is original and unique , two sides of elastic polymer which will change
the shape automatically to fit the sitting posture of your lower back and upper body , providing the fair and active  support.