Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a firmer...

https://hotel-wiki.win/index.php/Does_RF_Microneedling_Help_Sagging_or_Just_Texture%3F

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a firmer look, with results peaking around 3 to 6 months. Unlike RF, which heats skin to 40-45°C mostly for surface tightening, Ultherapy reaches deeper layers