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

https://www.red-bookmarks.win/ultherapy-uses-focused-ultrasound-to-target-the-4-5-mm-smas-layer-stimulating

Ultherapy uses focused ultrasound to target the deeper 4.5 mm SMAS layer, stimulating collagen over 3 to 6 months for gradual skin lift