Ultherapy targets the 4.5 mm SMAS layer with ultrasound energy, helping to lift...

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

Ultherapy targets the 4.5 mm SMAS layer with ultrasound energy, helping to lift and tighten deeper tissues. It’s different from RF, which heats skin to around 40 to 45°C for collagen boost but stays more superficial