The Steelcase Series 1 chair has a LiveBack flexor system in the backrest which conforms to your body and moves with you to support the spine as you change postures. The tilt mechanism is synchronized; the seat and back work in harmony with each other, keeping the body securely supported in the chair and feet firmly planted on the floor so you can recline without leaving your optimal zone for seeing and reaching your work. Feature set includes an adjustable seat depth, fully adjustable arms, adjustable lumbar, pneumatic seat height adjustment, recline tension adjustment (weight activated with adjustment and lock), flexing back with mesh upholstery, upholstered seat and wheels for carpet flooring. The seat features strong yet pliable foam which conforms to the body and creates pressure-free comfort. Flexible seat edge offers a bit of bend, right where you need it ~ relieving pressure points under your thighs. This chair will arrive unassembled and require some assembly and is covered by a 12-year warranty.