Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer for a deep...

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

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer for a deep lift, with results peaking around 3 to 6 months. RF heats skin to 40-45°C for collagen boost but doesn’t reach as deep. Standard HIFU is quicker but less precise than Ultherapy