Supportive Backrest - The open mesh design creates a breathable, well-ventilated backrest, yet with it’s resilient mesh, the back moulds to your back providing a more supportive seat, which helps align the spine and reduce pressure and muscle fatigue. Breathable Seat - The padded mesh seat is thick and resilient. Made from premium quality high density thick sponge and a breathable mesh clothe, preventing body heat and keeping your hips and legs cool and sweat-free. Multi-Function Mechanism - Pneumatic controls make it easier to raise or lower the seat. The rocking mode helps you to relax from heavy work, pull out the handle for rocking function and pull it in to stop. This chair can support a maximum weight of 250 lbs. Smooth & Durable Casters - The PU casters provide great mobility, suitable for hard floors, carpet and more, while being silent during swivelling and moving without scratching your floor surface. Rest Assured to Purchase - We have a professional customer service team, so if you have any questions, please do not hesitate to contact us. We are always with you.