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

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

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