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

https://tango-wiki.win/index.php/Thermage_vs_10THERMA_-_Are_They_Both_Monopolar_RF%3F

Ultherapy uses focused ultrasound to target the deep 4.5 mm SMAS layer, encouraging natural collagen over 3 to 6 months for gradual lifting. Compared to RF, which heats skin surface to around 40-45°C, it's deeper but less immediate