Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deep,...

https://telegra.ph/Why-Do-Before-and-After-Photos-Look-Good-for-HIFU-but-Results-Vary-08-18

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deep, natural lift, with results peaking around 3 to 6 months. RF heats skin between 40 to 45°C mainly for collagen tightening but less depth