These Husky chairs are new and improved. The legs are slightly bigger and that's a sturdy difference. The seat itself is designed for better student posture with a narrow top that allows shoulders to move freely. The oval opening on the back provides ventilation and relieves pressure on the lower back. Seat features a waterfall front edge to relieve pressure on legs. Leg end-caps match the seat color and no-show rivets won't catch hair or clothing. Stacks up to six high. 9-1/2" high. Ships UPS.