Sherpa is the reason to pick this one: seat and backrest are wrapped in the fleecy pile rather than vinyl, which makes a cold morning at the vanity noticeably easier. Thick high-density sponge sits beneath and holds its loft after months of use. Without armrests the chair keeps a 24 inch square footprint and pushes right up to a narrow desk. A pneumatic lift moves the seat through 3.5 inches, from 17 to 20.5 inches, and the seat itself measures 18 by 17 inches and turns a full 360 degrees. Five PP casters roll across hard floors and low pile alike. The frame is steel over plywood panels and takes 330 lbs, yet the whole chair weighs 15.5 lbs, so it lifts easily when a room gets rearranged.