Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for natural...

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

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for natural lift and tightening, with results peaking around 3 to 6 months. Radiofrequency heats skin to 40-45°C for collagen boost but works more superficially