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

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

Ultherapy targets the deep 4.5 mm SMAS layer using ultrasound to lift and tighten over 3 to 6 months, making results feel natural and gradual. RF heats skin to 40-45°C for collagen boost but works closer to the surface