technical, well-designed plastic school chair that stacks

I'm looking for a technically savvy and aesthetically pleasing plastic chair that is designed to stack easily for use in a secondary school. Durability is the primary requirement; I want a chair that can take a lot of use without breaking down. Comfort is a secondary requirement, as students of this age will be spending a lot of time sitting in these chairs. If you have the skills and experience to produce a chair that meets all of these requirements, then I would love to hear from you.