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

https://wool-wiki.win/index.php/Are_Thread_Lifts_More_Predictable_Than_Energy-Based_Devices%3F

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, which few treatments reach, offering a natural lift that improves over 3 to 6 months. RF heats skin to 40-45°C to boost collagen but doesn’t penetrate as deep