Ultherapy targets the deeper 4.5 mm SMAS layer using ultrasound energy,...

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 energy, encouraging natural collagen build-up with results peaking around 3 to 6 months