Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper...

https://gravewind33.gumroad.com/p/how-many-ultherapy-treatments-have-been-done-worldwide-unpacking-the-global-track-record

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper lift, with results peaking around 3 to 6 months. RF heats skin to about 40 to 45°C, stimulating collagen more superficially