Ergonomic Design: Dynamic bionic spine pressure relief ergonomic designed PP back frame chair to improve efficiency and comfort in the working environment Mesh: High quality breathable wire mesh that allows air to pass through and avoid sweating while you are seated on chair Mechanism: Weight balance butterfly single lock mechanism to allow increased relaxation Lumbar support: Beautifully designed lumbar support for your lower back Seat: High quality fabric 30 density cut foam seat cushion with PP shell support Armrest: Adjustable PP flip armrest (upturned armrest that is suitable for storage) Height Adjustment: Bifma certified gas lift for height adjustment Base: 320mm Nylon Base with 60R Nylon Castors for longer durability and stiffness of the base Assembly: Toolkit & detailed instructions manual included with the product. Contact our customer care for further assistance. Chargeable carpenter assembly service also available Warranty: Three years of warranty on all the components of the chair