Hbada desk chair·Ergonomic Design - Ergonomic chair back, protect the lumbar spine.Keep your body in a proper sitting position.90-125°rucking style provide you a little break during the working time.Height 10cm adjustable for different stature. ·90°Flip-up Armrest - Space saving flip-up arms for different situations. Fold up the armrest and push the chair under the table for space saving or reduce the distance between chair and table, let your back against the back of the chair, make it more comfortable ·Adjustable Lumbar Support - Find your best position by adjust the lumber support up and down, support the waist and reduce the burden. ·Environmental Material - Made of pure PP material makes the chair back supportive and healthy. The seat cushion is made of high elastic foam which makes it soft and breathable. ·Stable & Durable: Heavy duty base with smooth and silenced rolling casters, Max Capacity 250lbs