These Top Medical polyurethane sit stand stools give support while sitting or standing. Allows worker to stay in upright position while placing weight directly on seat. Ergonomically designed for mobility without putting added pressure on back and lower body of worker. These polyurethane sit stand stools come standard with seat tilt for better comfort. The Top Medical polyurethane saddle stools are one the most comfortable and versatile stools ever made. Our polyurethane saddle stools encourage you to sit in a saddle posture, which lowers the thighs, opens up the hips and puts the spine into a healthy lordotic curve.