Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, reaching...

https://wiki-cable.win/index.php/How_Do_I_Avoid_Getting_Talked_Into_the_Wrong_Tightening_Treatment%3F

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, reaching deeper than most RF treatments, which heat skin between 40 to 45°C for collagen boosting. Compared to standard HIFU, Ultherapy offers more precise energy delivery