Height adjustable drafting chair supports up to 300 lbs and raises the seat from 22.5 to 30.5 in so you can work comfortably at taller desks or counters. The ergonomic backrest with breathable mesh and adjustable lumbar support follows the curve of your spine to help reduce fatigue. Flip-up armrests let you switch between supported and armless sitting to clear the edge of a work surface. A high-density sponge cushion, adjustable foot ring, and smooth-rolling casters work with the 360° swivel seat to keep you supported and mobile during long tasks.