Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a natural...

https://fair-wiki.win/index.php/Does_Ultherapy_Hurt_and_What_Affects_Comfort%3F

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a natural lift that builds over 3 to 6 months. Compared to RF’s surface heating at 40 to 45°C, it reaches deeper for firmer results