Ultherapy uses focused ultrasound at a 4.5 mm depth to target the SMAS layer,...

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

Ultherapy uses focused ultrasound at a 4.5 mm depth to target the SMAS layer, promoting gradual skin tightening with peak results around 3 to 6 months