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

https://riversexpertchat.rivetgarden.com/posts/is-ultherapy-fda-cleared-for-lifting-or-just-tightening

Ultherapy uses focused ultrasound to target the 4.5mm SMAS layer, promoting gradual skin tightening over 3 to 6 months. Compared to RF, which heats tissue to 40-45°C for collagen boost, Ultherapy penetrates deeper