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

https://mylesxbqi254.trexgame.net/are-thread-lifts-more-predictable-than-energy-based-devices

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