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

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

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, offering deeper lift than standard HIFU or RF, which heats skin to around 40-45°C for collagen boost. Thread lifts mechanically lift but results show immediately and may last a year