Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for collagen...

https://wiki-canyon.win/index.php/Can_RF_Help_with_Body_Laxity_Too,_or_Only_Face_and_Neck%3F

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for collagen lift, with results peaking around 3 to 6 months