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

https://archeredxm754.timeforchangecounselling.com/does-ultherapy-help-with-skin-texture-or-only-lifting

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer deep under your skin, stimulating collagen over 3 to 6 months for natural lift