Our Energy Series Mobile Stack Chair provides exceptional functionality for a variety of school settings where students congregate to relax or work in groups. With a perforated back, air is better able to circulate providing greater comfort. Each chair leg has a dual-wheel caster protected by a "hood" for improved mobility. The weight capacity for the Energy Series Mobile Stack Chair is 400 pounds and is able to be stacked 15 chairs high. Choose from 11 eye-catching colors that are sure to match any school decor or setting or combine contrasting colors to add more color to any space. All are Green-Guard Certified to meet industry standards for low emissions.