The Raven Active Perch Stool is the perfect companion to your stand up desk. This adjustable height stool is designed to wobble prompting the user to use core muscles to keep you active. The design stimulates the spine for proper alignment and postural health. Standing while working increases blood flow. Weight tested for up to 275 lbs. To adjust perch yourself, use 1 hand and press up on the underside of the seat.