Ultherapy uses focused ultrasound energy to target the 4.5 mm SMAS layer,...

https://direct-wiki.win/index.php/How_Do_I_Choose_Between_Tightening_and_Lifting_for_My_Neck%3F

Ultherapy uses focused ultrasound energy to target the 4.5 mm SMAS layer, helping lift and tighten skin with results building over 3 to 6 months. Compared to RF, which heats skin to around 40-45°C for surface tightening, Ultherapy goes deeper