Ultherapy uses ultrasound energy targeting the 4.5 mm SMAS layer to stimulate...

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

Ultherapy uses ultrasound energy targeting the 4.5 mm SMAS layer to stimulate collagen deep under the skin, with results peaking around 3 to 6 months