Ergonomic design for proper posture: The kid desk chair provides dual back support and flipup armrests to support the back, waist, and arms. It is contoured to fit children's body curves and helps develop healthy sitting habits. Suitable for children aged 3 to 18. Easy multi size adjustment: The right side under the seat cushion offers a handle to adjust seat height from 17 to 21.7 inches. A knob at the rear under the seat cushion adjusts the depth of the seat for a growing child. Durable and reliable construction: Main structure is built with metal and plastic. The cylinder is strong and durable, providing safe and reliable support for daily use. Comfortable seating experience: Both the backrest and the seat cushion are filled with thick resilience sponge. The density foam offers good rebound, helping children sit comfortably for extended periods. Practical use scenarios: At home study time: Ideal for homework and online learning at a kid desk or study station. Computer or drawing tasks: Supports long sessions at a child computer or craft desk with ergonomic support. Reading and crafts: Suitable for quiet activities like reading, coloring, or small projects at a study desk. Key attributes at a glance: age range 318; seat height 1721.7 inches; adjustable seat depth; materials metal and plastic; cushion foam density and resilience; designed for ergonomic support and durable everyday use.