Ultherapy targets the 4.5 mm SMAS layer with ultrasound energy, helping to lift...

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

Ultherapy targets the 4.5 mm SMAS layer with ultrasound energy, helping to lift and tighten deeper tissues. It’s different from RF, which heats skin to around 40 to 45°C for collagen boost but stays more superficial