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

https://meet-wiki.win/index.php/What_Are_Ultherapy_%27Lines%27_and_Why_Do_They_Matter%3F

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, stimulating deeper collagen production with results that peak around 3 to 6 months. Unlike RF, which heats skin to 40-45°C for surface tightening, Ultherapy reaches deeper for lifting