Ultherapy targets the deep 4.5 mm SMAS layer with ultrasound to lift and...

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

Ultherapy targets the deep 4.5 mm SMAS layer with ultrasound to lift and tighten over 3 to 6 months. RF heats skin to 40-45°C for collagen boost but works more superficially