【HIGHT QUALITY CONSTRUCTION】 This simple office chair uses high-density sponge cushion, high breathable nylon mesh, durable base, solid rolling casters ,and D100 Gas lift. You can feel the quality when sitting on it. 【EXTRA LARGE BASE】Unlike other chairs on the market, JJS uses a much larger star base to ensure its customers maximum comfort and safety. You will never tilt over on this trusty companion. 【ADDITIONAL PADDING】In this model, we added extra thick cushion to support you for a long period of time. Say Goodbye to all your pain after seating for hours. 【ERGONOMIC SWIVEL CHAIR】 Pneumatic seat height adjustment and 360-degree swivel allows you to customize your comfort. Feeling lazy? Our quiet and sturdy rolling casters make sure you can go grab some snacks without leaving your seat. 【SATISFACTION GUANRANTEED】We believe in the quality of our products. That is why we are backing them up with 12 months warranty and FREE 45 days return policy. If there are any issues, please give us a call at 1-888-388-8557 and we are gladly to help you resolve anything over the phone.