They possess a waterfall seat edge to ease pressure on the backs of thighs and adjustable pod feet that allow for a level position on uneven surfaces. (emfurn.com)
Its breathable mesh material keeps you cool while the waterfall front seat edge removes pressure from the lower legs. (bedbathandbeyond.com)
8 years or at least 57 inches tall if (1) lap belt fits across hips and thighs, not abdomen (2) shoulder belt crosses center of chest and not neck (3) knees bend over seat edge when sitting up straight with his / her back firmly against seat back (iihs.org)