Ultherapy targets the 4.5 mm SMAS layer using focused ultrasound, lifting and...

https://technivorz.com/why-is-imaging-such-a-big-deal-in-ultrasound-skin-tightening/

Ultherapy targets the 4.5 mm SMAS layer using focused ultrasound, lifting and tightening over 3 to 6 months as collagen builds. RF heats skin to 40–45°C for surface tightening and quicker results but less depth