With ergonomics in mind, Hierarchy is a colorful and flexible solution for stimulating focus and motivation in your learning environment. Multiple sizes, bases, and vibrant colors for all ages of learners. Flexible and ergonomically shaped seat with lumbar support for easy position changes, eliminating stagnant environments. Smooth reinforced back allows for flex action without sharp ridges. Shell available with or without arms. Upholstered seat version available with your choice of graded-in fabrics. 4-leg chair available in four seat heights: 12", 14", 16", and 18" with heavy gauge chrome or platinum steel base. Includes nylon swivel glides. Patent pending. SCS Indoor Advantage Gold Certified.