Apollo Multifunction Task Chair features a ratchet back that moves up or down relative to the seat for lumbar support and comfort. Mesh back provides enhances airflow for breathability. Set back at an angle for personalized comfort in reclined position. Seat-height adjustment lets you position the seat height relative to the floor. Chair rocks back and forth with adjustable, center-tilt mechanism. Fabric-upholstered, padded waterfall seat with sloping front reduces pressure on the back of the knees. Tilt-tension control with tilt lock allows you to adjust the recline rate based on your weight. Seat tilts forward to change the angle for a comfortable position when you're using a keyboard. Arm-height adjustment adjusts arm up or down while arm pads angle in or out. Nylon, five-star base features casters for easy mobility. Chair is Greenguard certified to have low chemical emissions.