【ErgoDesign Stool Shape】This pair of ergonomic stools features a 44cm/17.3″ wide seat, thick foam-padded cushion, and curved shell design back that provide extreme comfort, supporting and relaxing your back and legs. 【Large Base】The diameter of the base is increased to 16.3″/ 41.5 cm, expanding the stressed area so that the durability and stability can be well accelerated. 【Dual-operation Functions】This barstool has a 360° swiveling seat and an SGS-Certified pneumatic cylinder. With the swivel stool seat, no more frequent moving is needed when fetching or chatting. Besides, the seat height can be adjusted with a gas lift handle between 62.5-84.5cm and 24.6-33.3″ for your diverse seating preference. 【Simple to Install】The assembly of this bar stool should not be a concern as it is quite straightforward.