Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to lift and...

https://wiki-cable.win/index.php/What_Does_a_%27Proper_Assessment%27_Look_Like_Before_Skin_Tightening%3F

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to lift and tighten deep tissues, with results peaking around 3 to 6 months. RF heats skin to 40-45°C to stimulate collagen closer to the surface, ideal for mild tightening