Adjustable height moves from 15-20" on pneumatic lift. Astute seating takes the concept of the plastic shell chair and makes it even more comfortable and flexible. Designed to encourage proper posture, the light textured shell holds students in place and the ergonomically designed contour shell comfortably fits the body. This chair has stood the test of time in the field, performing in classrooms for decades. Choose standard Black base, or special order Platinum base (shown). This model is height adjustable and measures 21"D x 19"W x 15"-20"H. Includes casters. Wt. 22 lbs. Ships UPS.