Yaheetech Mesh Mid-Back Office Chair Lumbar Support Computer Chair Adjustable Task Chair Swivel Desk Chair with Arms & Casters Wheels HEAVY DUTY: This office chair is constructed of premium nylon mesh backrest, plastic armrest and metal; solid structure can satisfy your daily needs, durable and sturdy chair for your long-term use HEIGHT ADJUSTABLE: Features with a gas lift beneath the seat to adjust the height, easy adjustment to customize your desired chair height THOUGHTFUL-DESIGNED BACKREST: According to your different sitting position, the tilt angle of the backrest can be adjusted by a simply rotating the control knob under the seat; breathable backrest is made of high quality nylon mesh, which is good for heat dissipation in summer SIMPLE ASSEMBLY: All necessary tools and hardware are included, easy to assemble under the detailed instructions EXTRA HANGING SPACE: Features an extra rod on the back of the backrest for hanging coat and bags, an innovative design to save your space