Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, stimulating...

https://xeon-wiki.win/index.php/Does_Ultherapy_Hurt_and_What_Affects_Comfort%3F

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, stimulating collagen deep beneath the skin. It’s precise and non-invasive, with results peaking around 3 to 6 months