Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, reaching...

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

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, reaching deeper than most RF treatments that heat skin to about 40-45°C. Compared to standard HIFU, it offers precise energy delivery with fewer sessions