The computer desk chair features 90°folding armrests, which allow you to turn it up or down for convenient storage and versatile use. The ergonomically designed backrest with adjustable lumbar support alleviates the tiredness of your spine as well as waist. Thanks to the rocking function, you can rock back and forth for relaxation during working time. The waterfall seat padded with high elastic sponge and covered with PU leather shows perfect performance in providing higher comfortableness. What’s more, swivel task chair equipped with smooth rolling casters gives you more freedom in fetching documents or communicating. All in all, this height adjustable office chair will be a perfect complement to your house, which can fulfill the requirement of people with different height. Feature90°flip up armrest for easy storage and better support 93°-105° rocking backrest for higher relaxation 17.5''-21''seat height adjustment to find a more suitable position Ergonomic back with adjustable lumbar support for minimizing fatigue Sponge padded cushion with waterfall design to disperse legs pressure Combine the breathable mesh with soft PU leather for double comfortableness 360° swivel casters move flexibly and quietly without scratching the floor Sturdy five-claw base with premium gas lift for long-lasting service life Easy installation with complete accessories and detailed instructionsSpecificationColor: Black Material: Nylon, Mesh, Sponge, PP, PU Leather Overall Dimension: 26.5'' x 26.5'' x 45.5''-49'' (L x W x H) Adjustable Seat Height: 17.5''-21'' Net Weight: 30 lbs Weight Capacity: 300 lbs Package Includes 1 x Mesh Office Chair 1 x User Guide