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

https://lunasbrilliantdigests.evergrovio.com/posts/how-do-i-know-if-i-need-surface-tightening-or-structural-lift-2

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer beneath your skin, promoting a natural lift over 3 to 6 months