Ergonomic ExecutiveBreathable and strong mesh: Made of stretchy and strong mesh that promotes air circulation, increases breathability and ultimate comfort, and prevents heat build up. Ergonomic Back: The Smugdesk chair features an ergonomic functional mid back design and elastic mesh structure, its lumbar support design allows you to maintain a correct sitting position for a long time, keeping your spine in a comfortable state, Reduce back pain caused by wrong posture.