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

https://victor-wiki.win/index.php/Best_Non-Surgical_Option_for_Moderate_Sagging_and_Jowls:_Ultherapy_and_Ultherapy_Prime_Explained

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper lift, with results peaking around 3 to 6 months. In comparison, RF heats tissues to 40-45°C, promoting collagen but with a gentler lift