Our height-adjustable desk chair will grow with your little one(6-15 years old). The premium gas lift system and an adjustment lever allow the chair to easily lift up and down. Ergonomic backrest helps kids to develop a good sitting posture. Smooth armrests and elastic mesh seat add more sitting comfort. The breathable nylon mesh fabric ensures heat dissipation and excellent durability. Besides, the 360° swivel seat ensures easy changing direction. 5 flexible wheels allow for easy movement. And the sit-brake wheels will automatically lock when the pressure is over 55 lbs and automatically loose when kids stand up.Feature31.5"-36" height adjustable design is suitable for kids of different ages(6-8 years old, 9-12 years old, 13-15 years old) Curved backrest, side armrests and comfortable seat to support your back, waist, arms and hip 360-degree swivel seat for kids to change direction without moving the chair 5 sit-brake wheels can be locked under 55 lbs of pressure Breathable mesh fabric ensures air ventilation and heat dissipation High-quality PP frame for long-lasting service life More details of the chair: rounded corners and cute colors Great for the dorm, kid’s bedroom or study room Easy to assemble with clear user manualSpecificationColor: Blue/Pink/Purple Material: Nylon Mesh, Sponge, PP Overall Dimension: 22.5" x 22.5" x 31.5"-36" (L x W x H) Seat Height: 17"-21.5" Seat Dimension: 17" x 15"(W x D) Backrest Dimension: 17" x 15"(W x H) Diameter of the Base(With Wheels): 22.5" Diameter of the Base(Without Wheels): 19.5" Applicable Age: 6-15 Years Old Weight Capacity: 330 lbs Net Weight: 14.5 lbs Package includes: 1 x Kids Desk Chair 1 x Instruction