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

https://www.tool-bookmarks.win/ultherapy-uses-focused-ultrasound-targeting-the-4-5-mm-smas-layer-for-a-deeper

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