Vinyl BIGGER, BETTER. Safco Uber Big and Tall Mid Back Chair provides comfortable seating for workers of all shapes and sizes. The cushioned-back support and 360 degree swivel seat offer an ergonomic, comfortable option for weights up to 500 lbs. RATED FOR 24-7 USE. This heavy-duty desk chair works around the clock in call centers, dispatch operator facilities and other multi-shift environments. Rated for 24-7 use (more than a 40-hour work week). HEIGHT ADJUSTABLE. Pneumatic lever provides easy height adjustment from 19.5" to 23.5" for a comfortable, personalized fit. Back features a tilt adjust with tilt tension and lock. ENHANCED COMFORT. Waterfall seat edge may help improve circulation by reducing pressure points while seated. PRODUCT DIMENSIONS. Finished product dimensions: 27"W x 30.25"D x 36.5 - 40.5"H. OPTIONAL ACCESSORIES. Accessories available (but not included): Shorter 4" Pneumatic Cylinder (3489), and T-Pad Arms Set (3496).