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

https://wiki-fusion.win/index.php/How_Do_I_Choose_Between_Tightening_and_Lifting_for_My_Neck%3F

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, stimulating collagen deep beneath the skin. It typically takes 3 to 6 months to see peak results