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

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

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, working deep beneath the skin for gradual lifting that peaks around 3 to 6 months. RF heats the surface to 40-45°C for collagen boost with milder results and quicker recovery