Our ergonomic study desk chair is a perfect gift for your kids! Kids grow so fast that they need a study chair that can grow with them. Our desk chair with adjustable height and seat depth is the perfect choice for growing children. You can raise the seat height from 15.5'' to 23'' with the rotary knobs. The height of the backrest can also be adjusted from 30.5'' to 40'' to match your child's height and posture. Equipped with a double backrest that embraces the contour of the back, this chair can provide all the support that kids need during hours of sitting and studying. And the wheels will automatically lock when there are more than 88 lbs of weight applied on the chair seat to make children better focus on their tasks.