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

https://astro-wiki.win/index.php/Ultherapy_for_the_Neck_%E2%80%93_When_Do_Results_Peak_at_3_to_6_Months%3F

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