Innovative, school stack chair is built for comfort and durability. The 18" seat height is perfect for users who are ages 12 years old and up. Leg and seat angles are designed for better fit and comfort for adults, adding a slight tilt-back to the seat. Stack chair features a molded plastic seat with vented back for comfort, reinforced ribbing in back and under the seat for added strength, and steel lower back support. Frame and screws do not penetrate through the seat surface. Chrome chair legs are equipped with nylon swivel glides perfect for hard floors.