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

https://blogfreely.net/sordusgvrj/is-there-downtime-after-a-thread-lift-in-singapore

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