The Polyurethane Cleanroom line of chairs with large back from Perch Chairs & Stools is specifically designed to reduce particulate contamination to the local environment. This type of seating is perfect for pharmaceutical, healthcare and electronics sectors. These polyurethane cleanroom chairs offer total body support with advanced ergonomic features that improve productivity and reduce fatigue. The ergonomically contoured waterfall seat and back were designed to improve posture, circulation and comfort. These polyurethane chairs feature an Ease Adjust System which allows you to adjust the pneumatic height and lumbar back support from a seated position. The lumbar support adjusts 4 ways – up, down, forward, and back for a personalized and posture correct fit. Optional features include foot ring, seat tilt, armrests, and stationary caps. 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 fiberglass nylon and steel to make sure you can trust your chair for many years to come. We promise to offer the very best quality and craftsmanship, and we guarantee it with a 12-year warranty on parts and a lifetime warranty on cylinders.