PC21 Ergomonic Kneeling Chair for Office and Home Steel Frame 
PC35 Ergonomic Kneeling Chair with Memory Foam Layer - Improves Posture - Adjustable Stool for Home and Office - Thick Comfortable Cushions.
Encourages a more ergonomic posture as it distributes your weight across the body more evenly than a standard chair.
The durable and stable steel Fame is height adjustable to get into your preferred seat height.