Ultherapy targets the 4.5 mm SMAS layer with focused ultrasound, reaching...

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

Ultherapy targets the 4.5 mm SMAS layer with focused ultrasound, reaching deeper than standard HIFU, which usually treats up to 3 mm. RF heats skin to about 40-45°C for collagen boost but stays more superficial