A traditional, heat-activated nitinol archwire that has lower unloading forces than copper-alloy wires and is softer when cooled or at room temperature, making it easy to ligate. With its superior bend performance, it transforms to a super-elastic state inside the mouth when heated to the body's normal temperature, providing a gentle, consistent force that is most efficient for leveling and aligning. A slight temperature decrease will relax the force temporarily. Available in a natural archform.