The Height-Adjustable Armless Ergonomic Children's Study Chair (Model CHD-STU-001) features a streamlined, child-sized armless profile paired with a stable 5-star base layout that balances open movement space with reliable structural support. Its form prioritizes unobstructed seated motion, with a contoured backrest and smoothly padded seat shaped to encourage upright posture, finished in a matte gray base that complements a range of interior palettes, with three available upholstery color options to suit personal preferences. Constructed for durable daily use, the chair pairs high-density molded foam for the seat cushion and contoured supportive foam for the backrest, upholstered in breathable 3D mesh or 0.8mm thick knitted fabric for comfortable extended seating. The central support column is formed from powder-coated cold-rolled steel, connected to a glass-fiber reinforced nylon 5-star base fitted with soft-tread PU casters that have polypropylene housings. Textured ABS plastic adjustment knobs offer secure grip during position changes, while an integrated non-slip ABS footrest sits on the base, and a Class 3 steel gas lift enables smooth height changes. Stitched seams are finished to a consistent pitch for long-term upholstery durability. Practical functions are tailored to growing users and flexible use: the seat offers a 200mm vertical height adjustment range with indexed locking positions, alongside 60mm of forward and backward seat depth travel controlled by a side rotary knob. The chair supports full 360-degree swivel for easy repositioning, with gravity-locking casters that engage automatically when a seated load is applied to prevent unintended movement. The backrest holds a 3-degree fixed tilt angle for upright posture support, with three suggested lock positions up to a 125-degree recline for relaxed positioning. An integrated hook at the top rear of the backrest holds school bags or personal items to keep work surfaces clear. This chair fits a range of residential and commercial spaces: it works well in home study areas paired with height-adjustable desks for homework sessions, in primary school classrooms to accommodate growing students across grade levels, in children’s tutoring centers for durable mobile seating during one-on-one or group sessions, in quiet reading corners for extended independent reading, and in art or activity spaces where flexible, movable seating supports craft and creative work. It is also well suited for multi-child households, with multiple color options to match different preferences. Procurement teams and residential buyers should note the chair ships as one set across two cartons, with a reference assembly time of 40 minutes per unit, allowing for straightforward installation planning for bulk or single purchases. The product supports a recommended maximum user weight of 100kg, with a targeted user age up to 12 years, making it suitable for long-term use as children grow. Load testing metrics confirm robust static load capacity for the cushion, supporting reliable performance in high-traffic shared spaces.