The new Truly. Ergonomic Series chairs are Office Master's most ergonomic chairs yet. Find the Truly. task chair or stool that's right for you, whether you need full adjustment control or none at all. This office chair is great for both a moderate everyday user, to a full-time business professional with a demanding workload. Use its ample adjustment features like tilt lock to move the chair to your optimal working position for every task. Finally, find unique comfort with adjustable lumbar support and a double layer seat cushion with memory foam.