The innovative Kore Design® Wobble Chair with it's 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. Great for older children and young teens, the seating height can be easily adjusted with the 360? Actuator Ring to grow with your child. Seat height can be fine-tuned between 16.5" and 24". Suggested for ages 9-14; Grade 4-9; child height 53"-70".