Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, making it...

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

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, making it popular for deeper lifting compared to RF’s gentler 40 to 45°C heat which works mainly on the skin surface. Standard HIFU is similar but often less precise