Ultherapy targets the 4.5 mm SMAS layer with ultrasound energy, reaching deeper...

https://www.bookmark-xray.win/ultherapy-uses-focused-ultrasound-targeting-the-4-5-mm-smas-layer-for-gradual

Ultherapy targets the 4.5 mm SMAS layer with ultrasound energy, reaching deeper than most RF treatments, which warm skin between 40 to 45°C but mainly affect the surface