Ergonomic design fits your body curved for optimal support Contours to your back lumbar and hip to reduce pressure points Selected materials for enhanced seating comfort Breathable mesh fabric allows for good airflow to keep you cool Thick sponge cushion relieves pressure during ...Ergonomic design fits your body curved for optimal support Contours to your back lumbar and hip to reduce pressure points Selected materials for enhanced seating comfort Breathable mesh fabric allows for good airflow to keep you cool Thick sponge cushion relieves pressure during long-time sitting Built-in lumbar support helps maintain a proper spine alignment Height-adjustable rocking swivel chair for an energetic workday With a rocking tension control and height adjustment for easy operation 90° flip-up armrests save a lot of space when it needs to tuck under your table 360° rolling casters ensure easy mobility on various surfaces Premium gas cylinder and sturdy 5-claw base for added stability Assembly needed