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

https://bizzmarkblog.com/is-ultherapy-fda-cleared-for-lifting-or-just-tightening/

Ultherapy targets the deeper 4.5 mm SMAS layer with ultrasound energy, making it unique compared to RF and standard HIFU that work more superficially around 40 to 45°C. Thread lifts offer immediate lift but with a shorter timeline