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

https://trulyexpatlifestyle.com/non-surgical-skin-tightening-in-singapore/

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