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

https://www.mediafire.com/file/et59n4ewy7unyct/pdf-24805-21355.pdf/file

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to tighten skin deeper than RF and standard HIFU, which mostly warm surface layers around 40 to 45°C