Rocking backrest can be adjusted from 90° to 115°for relaxation Adjustable lumbar support provides customized comfort for working and leisure time Ergonomic design perfectly fit your body curve to reduce fatigue Flexible height adjustment and 360° swivel seat suit different needs ...Rocking backrest can be adjusted from 90° to 115°for relaxation Adjustable lumbar support provides customized comfort for working and leisure time Ergonomic design perfectly fit your body curve to reduce fatigue Flexible height adjustment and 360° swivel seat suit different needs Lifting lever & tension control (tight & loose) for easy adjustment Made of selected materials for upgraded sitting experience Breathable mesh to promote airflow to keep you cool during long work sessions High elastic sponge to provide more coziness for your workday Equipped with adjustable 2D headrest for comfortable support 90° flip-up armrests to slip the chair under the desk to save space Premium gas lift and stable 5-claw base for reliable structure Universal wheels allows for effortless movement on any floor Assembly needed