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

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

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to encourage gradual collagen tightening, with results peaking around 3 to 6 months