Optimal Comfort - The seat padded (51 cm wide by 50 cm deep) with high density sponge is soft and will not deform from long-term use; using breathable mesh, the ergonomic backrest (65 cm high) with lumbar support takes the pressure off your lower spine; upholstered headrest provides complete comfort Adjustable - Padded mesh armrests give comfort and support for your arms and shoulders; the armrests can flip up to easily fit underneath your desk saving space; seat height (45-54.5cm high) can be adjusted easily; tilt function helps you lean back and relax during the hustle and bustle of daily work. For user whose height is shorter than 175 cm Sturdy and High-Load Bearing Capacity: A 5-star steel base (dia.: 66 cm) offers stability and a high load capacity of 120 kg. The auto-return cylinder allows for effortless height adjustments, and its sturdy construction ensures long-lasting use Easy Mobility and Versatility - The swivel office chair runs smoothly on PU castors in silence and is resistant to wear, suitable for most flooring; perfect mesh chair for your office, conference room or home study Easy to Assemble - Numbered hardware fittings with blister package to avoid loss or being mixed up; with illustrated instruction and assembly tool; 1 extra castor and 1 extra spare for each type of screw Safety Castors: The safety castors with a pressure-sensitive brake mechanism roll freely when you are sitting on the computer chair, but keep the chair in place when you stand up