Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, stimulating...
https://bizzmarkblog.com/is-ultherapy-fda-cleared-for-lifting-or-just-tightening/
Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, stimulating collagen deep under your skin for a natural lift. Compared to RF, which heats the surface around 40 to 45°C, Ultherapy penetrates deeper