Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, offering a...

https://smart-wiki.win/index.php/Are_Thread_Lifts_More_Predictable_Than_Energy-Based_Devices%3F

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, offering a deep lift that tightens skin over 3 to 6 months. Compared to RF that heats at 40 to 45°C mainly in the dermis, Ultherapy goes deeper