Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper...

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

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper lift compared to standard HIFU, which usually targets 1.5 to 3 mm skin layers. Radiofrequency heats tissue to around 40-45°C to boost collagen more superficially