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

https://donovansultimatewords.nexorafield.com/posts/does-ultherapy-hurt-and-what-affects-comfort

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for deep tissue lifting, with results peaking around 3 to 6 months