Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, reaching...

https://archeredxm754.timeforchangecounselling.com/does-ultherapy-help-with-skin-texture-or-only-lifting

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, reaching deep for lifting effects that build over 3 to 6 months. Compared to RF, which heats skin surface to 40-45°C for collagen tightening, Ultherapy penetrates deeper