Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer beneath your...

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

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer beneath your skin, reaching deeper than most RF devices, which heat tissue around 40 to 45°C. Compared to standard HIFU, Ultherapy offers precise energy delivery