Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to lift and...

https://www.bookmark-suggest.win/ultherapy-targets-the-deeper-4-5-mm-smas-layer-using-focused-ultrasound-for

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to lift and tighten over 3 to 6 months. RF heats skin to around 40-45°C for gradual collagen boost but works more superficially