Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer deep under...

https://star-wiki.win/index.php/Can_I_Do_Ultherapy_and_RF_Together_or_Is_That_Too_Much_Heat%3F

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer deep under your skin, encouraging natural collagen over 3 to 6 months. RF heats the surface to about 40 to 45°C for a quicker, milder firming effect