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

https://wiki-neon.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 gradual lift, with results peaking around 3 to 6 months. Radiofrequency heats tissue to 40-45°C for collagen tightening but works more superficially