Ultimate Comfort and Ergonomic DesignDesigned to support the natural curve of your spine, our ergonomic office chair features adjustable lumbar support to alleviate back strain. The thick 2.76'' padded seat, crafted with high-resilience foam, ensures excellent comfort by relieving hip pressure Customizable Seating ExperienceWith a height adjustment range of 18.11'' - 20.87'' (46cm - 53cm), our chair accommodates a wide range of users. In the spare time of work or study, you can enter the rest rocking mode by adjusting the back leaning (Clear instructions provided through our images and videos) Stable & Durable ChairThe three-stage steel gas spring and heavy-duty nylon legs with maximum load of 300LB, certified by BIFMA and SGS. The thickened explosion-proof steel chassis is hard-wearing, all the details make this desk office chair use longer Quite Easy to Install & Installation VideoThis mesh office chair comes with all hardwares and necessary tool