Ultherapy targets the deep 4.5 mm SMAS layer using ultrasound energy,...

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

Ultherapy targets the deep 4.5 mm SMAS layer using ultrasound energy, stimulating collagen over 3 to 6 months for gradual lifting. Compared to RF, which heats skin to 40-45°C mainly for surface tightening, Ultherapy offers deeper lift