Ergonomic Kid chair 1) Polyester fabric, non-toxic, non-damaging to the skin, waterproof/dust/fouling 2) High density foam with plywood inside 3) Q235 steel back support 4) Multi-function mechanism with up & down, sliding seating fucntion 5) Children's special used gaslift only up and down, passed BIFMA test 6) Gravity brake PU castors Dimmentions: 46*53-62*89.5-107.5 cm Height adjustable 89.5-107.5 cm