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

https://www.hometalk.com/member/254051008/alice1337254

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, stimulating collagen deep beneath the skin. Results build gradually, peaking around 3 to 6 months. Compared to RF, which heats tissue to 40–45°C, Ultherapy reaches deeper layers