Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, stimulating...

https://fun-wiki.win/index.php/Thread_Lift_Results_Last_12_to_18_Months_%E2%80%93_What_Happens_After%3F

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, stimulating collagen deep beneath the skin. Results build gradually, peaking around 3 to 6 months. Compared to RF, which heats tissue to 40–45°C, Ultherapy reaches deeper layers