The wheels are the clever part. Five sit-brake casters sit under this chair, and they lock automatically once about 55 lbs of pressure is on the seat, which means the chair rolls freely when a child is pushing it to a desk and stops rolling the moment they sit down. Anyone who has watched a child slide backwards mid-sentence will understand why that matters. Above them, the chair adjusts from 31.5 in to 36 in overall with the seat moving between 17 in and 21.5 in, a range built to cover ages 6 to 15 rather than a single school year. The backrest is curved, and combined with side armrests and a shaped seat it supports back, waist, arms and hips instead of just the middle of the spine. Nylon mesh across the seat and back lets heat escape, which keeps a bedroom study session bearable in summer. A Pp frame handles the structure and carries up to 330 lbs, and the base measures 22.5 in across with the wheels on for a wide, stable footprint. Rounded corners keep it safe, it weighs 14.5 lbs.