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

https://trentonsmasterop-ed.readspirex.com/posts/does-ultherapy-hurt-and-what-affects-comfort

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper lift, taking about 3 to 6 months to show peak results. Compared to RF that heats skin to 40-45°C mainly for collagen tightening, Ultherapy reaches deeper