– Lower back support is definitely lacking due to the lower curvature of the bottom of the backrest of the chair. It should lower down to meet the seat of the chair before curving back at such an extreme degree. – Back of chair only locks in 3 preset positions: upright, around 75-80 degrees back, or 45 degrees back.
https://www.amazon.com/NOUHAUS-Ergo3D-Ergonomic-Office-Chair/dp/B07L4ZYDWB

