Therm-A-Form ULTRA™ is a new, improved, copper-free, body heat activated nickel-titanium wire that has lower ligating forces than copper alloy wires and is noticeably softer at room temperature, so it’s extremely easy to ligate. Then, with its superior cyclic bend performance, it transforms to a super elastic state inside the mouth offering gentle, continuous tooth-moving force. Ideal for adult patients with significant crowding. A quick cold drink temporarily eases the force– which makes sensitive patients happy.