Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer beneath your...

https://oscar-wiki.win/index.php/Ultherapy_vs_RF_Microneedling:_Which_Is_Better_for_Crepey_Skin%3F

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer beneath your skin, reaching deeper than most RF devices, which heat tissue around 40 to 45°C. Compared to standard HIFU, Ultherapy offers precise energy delivery