Ultherapy targets the 4.5 mm SMAS layer using focused ultrasound, lifting and...

https://beckettsexcellentjournal.cloudhinter.com/posts/secret-rf-vs-thermage-what-is-the-real-difference

Ultherapy targets the 4.5 mm SMAS layer using focused ultrasound, lifting and tightening skin gradually with results peaking around 3 to 6 months. Compared to RF, which heats skin to 40–45°C for collagen boost, Ultherapy reaches deeper layers