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

https://page-wiki.win/index.php/If_I_Did_HIFU_Before_and_Saw_Nothing,_Should_I_Try_Ultherapy_Next%3F

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, working deep beneath the skin for gradual lifting that peaks around 3 to 6 months. RF heats the surface to 40-45°C for collagen boost with milder results and quicker recovery