Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, stimulating...

https://juliusssmartcolumn.wordcanopy.com/posts/can-i-do-ultherapy-and-rf-together-or-is-that-too-much-heat

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, stimulating deeper collagen production with results that peak around 3 to 6 months. Unlike RF, which heats skin to 40-45°C for surface tightening, Ultherapy reaches deeper for lifting