Ergonomic zones on the high backrest and thick waterfall seat cushion support your shoulders, back, and legs during long computer sessions. The contoured backrest and padded armrests give your upper body a relaxed position while you work. An adjustable backrest with rocking tension control lets you choose a tighter or looser recline, and the lifting lever raises or lowers the seat between 19.5-in and 23-in. The 28 x 30 x 43.5 in frame includes a 21.5 x 20 in seat and 21.5 x 26.5 in backrest to fit different users. A 360° swivel seat, gas lift that supports up to 330 lbs, 5-claw metal base, and smooth rolling casters help you move easily around a home office or meeting room.