Ultherapy uses ultrasound energy targeting the 4.5 mm SMAS layer, offering a...

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

Ultherapy uses ultrasound energy targeting the 4.5 mm SMAS layer, offering a deeper lift compared to standard HIFU, which usually focuses on 1.5 to 3 mm depths. RF heats skin to around 40-45°C for collagen tightening but doesn’t reach the SMAS