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

https://xeon-wiki.win/index.php/How_Do_Doctors_Decide_Ultherapy_Energy_Level_and_Depth%3F

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