Analogy Stack Chair provides a striking, upright design that features ergonomic support and durability. Contoured shell creates a supportive back for comfortable sitting. Tubular steel frame supports the one-piece, polypropylene shell for added durability and stability. Extra-large shell accommodates all body types. The 18-1/2″ seat height is perfect for students. Four-leg chair stacks up to eight high for space-saving storage.