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

https://hectorsmasterinsight.novacrestiq.com/posts/thread-lift-migration-how-common-is-it-and-what-does-it-look-like

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a natural lift that improves over 3 to 6 months. Compared to RF, which heats skin around 40 to 45°C to boost collagen, Ultherapy reaches deeper tissue without downtime