EKKIO Adjustable Ergonomic Office Kneeling Chair (Black)EKKIO Adjustable Ergonomic Office Kneeling Chair (Black) Features Robust Construction for Endurance: The chair boasts a rugged construction designed to endure substantial loads. Its sittng surface is crafter from high strength PVC material, ensuring a durable and resilient foundation. This not only provides a robust sitting experience but also prevents the infiltration of swear, enhancing comdort during prolonged use. Ergonomic Excellence for Child