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

https://wiki-byte.win/index.php/Does_Ultherapy_Help_with_Skin_Texture_or_Only_Lifting%3F

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for deeper lifting, with results building up to 3 to 6 months. Compared to RF’s surface-level heating around 40 to 45°C, Ultherapy offers more precise depth