Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer deep under...

https://charlie-wiki.win/index.php/Why_Do_Some_People_See_No_Change_After_HIFU%3F

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer deep under the skin, promoting gradual lifting and tightening with results peaking around 3 to 6 months