Ultherapy targets the deeper 4.5 mm SMAS layer using ultrasound to lift and...

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

Ultherapy targets the deeper 4.5 mm SMAS layer using ultrasound to lift and tighten skin gradually over 3 to 6 months. RF heats the skin surface to 40 to 45°C for collagen stimulation but doesn’t reach as deep