Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer beneath your...

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

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer beneath your skin, reaching deeper than most RF devices, which heat tissue around 40 to 45°C. Compared to standard HIFU, Ultherapy offers precise energy delivery