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

https://highstylife.com/thermage-vs-10therma-are-they-both-monopolar-rf/

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