Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer deep under...

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

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer deep under your skin, stimulating collagen over 3 to 6 months for a natural lift