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

https://www.bookmark-jungle.win/ultherapy-uses-focused-ultrasound-to-target-the-4-5-mm-smas-layer-a-key

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