The innovative Kore Design Kids Pre-Teen Wobble Chair with its gently-rounded bottom encourages active sitting and allows one's knees, hips and back to find comfortable and ever-changing positions. Continuous movement increases Secondary Focus – concentrating on the task instead of fixating on sitting still. Active sitting can also help improve posture and prevent pain or stiffness that may result from prolonged sitting. Seat height 18.7"; suggested for ages 10-11; Grade 5-6; child height 54"-57".