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

https://highstylife.com/thermage-vs-10therma-are-they-both-monopolar-rf/

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