Ultherapy uses focused ultrasound energy to target the deeper 4.5 mm SMAS...

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

Ultherapy uses focused ultrasound energy to target the deeper 4.5 mm SMAS layer, stimulating collagen over 3 to 6 months for gradual lifting. Compared to RF, which heats skin to 40-45°C mainly in the superficial layers, Ultherapy reaches deeper tissue