Previous page Massage Lumbar Support The lumbar pillow with a USB cable provides a relaxing massage when you feel tired. Patent Linkage Armrest We have carefully analyzed the reasons for the instability of linkage armrests , and after professional experiments, we have improved their stability. Next page Previous page Multifunctional Tilt Mechanism The multifunctional tilt mechanism adapts easily to your needs. Class 4 Gas Cylinder Class 4 gas cylinder provides industry-leading durability, stability and safety. Reinforced Nylon Base The matte black base is made of durable nylon and can carry up to 300LBS. Next page 1 Tilt Mechanism 2 Class 4 Gas Cylinder 3 Nylon Base What are the improvements of LS-6657 series chairs? We have listened to many customers and removed the side wings of the seat and added spring pocket on the interior of the seat to give a significant increase in comfort. What is the size of the seat? The seat cushion is 20.1 inches wide and 19.3 inches deep