Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to lift and...

https://www.hometalk.com/member/254051008/alice1337254

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to lift and tighten skin gradually over 3 to 6 months. Compared to RF, which heats tissue around 40 to 45°C for collagen boost, Ultherapy penetrates deeper for muscle-level impact