Our cleanroom chairs are covered in vinyl on the bottom as well. Filters are also added to the chairs to keep particulates from entering the chair from the air, which makes it a proper cleanroom chair. Meets stringent Cleanroom standards. The ergonomically contoured waterfall seat was designed to improve circulation and comfort. We’ve seen other chairs fall apart almost out of the box. Bad welds, cheap casters, poor cylinders – they’ll do your chair in quickly. That’s why we place so much importance on build quality. This model employs reinforced steel to make sure you can trust your chair for many years to come. We promise to offer the very best quality and craftsmanship.