ApexDesk ALSC2533-BL Little Soleil DX Series Children's Height Adjustable Chair, Blue Height, backrest and seat can easily be adjusted by twist n lock knob Seat height adjustable from 12" to 21". Backrest height adjustable from 21" to 32" Ergonomically-contoured & comfortable seat/backrest.Durable steel-constructed frame and features a five-star base with locking casters Chair is designed to swivel 15 degree left and right when casters are locked Easy assembly - within 10 minutes!