Duorest Kids DR-280E, Ergonomic Student Office Desk Chair with Detachable Footrest and Expandable Frame - Fabric Seat and Backrest height Adjustment for individual fit Expandable/Adjustable Frame for proper fitting of all ages Triple Y Wide Base with 6 urethane casters for extra stability Adjustable/Detachable/Swivelable Footrest for individual fit, locking from sliding and rolling, and for proper knee posture while sitting Meets or exceeds all U.S. home office furniture industry standards (ANSI/BIFMA)