Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to tighten...

https://wool-wiki.win/index.php/Are_Thread_Lifts_More_Predictable_Than_Energy-Based_Devices%3F

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to tighten skin gradually over 3 to 6 months. Compared to RF, which heats tissue to around 40-45°C for surface collagen boost, Ultherapy reaches deeper