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

https://highstylife.com/thermage-vs-10therma-are-they-both-monopolar-rf/

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, reaching deep for lifting effects that build over 3 to 6 months. Compared to RF, which heats skin surface to 40-45°C for collagen tightening, Ultherapy penetrates deeper