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

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

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