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

https://www.protopage.com/samuel-flores05#Bookmarks

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