-Angle Lock and height adjustable levers for easy controlling-Back knob for back height adjustment-90°-135° adjustable angles offer the most suitable sitting posture-Breathable mesh fabric and high elasticity sponge offer you ultimate comfort-Ergonomic headrest curved seat and linkage armrests support your head neck hip and arms-Retractable footrest enables you to stretch legs-SGS gas rod for stable lifting and strong weight capacity-5-claw metal base ensures overall stability-5 universal whee