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

https://wiki-net.win/index.php/Can_Ultherapy_Replace_a_Facelift_if_It_Targets_the_Same_SMAS_Layer%3F

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, reaching deeper than most RF treatments, which heat skin between 40 to 45°C for collagen boosting. Compared to standard HIFU, Ultherapy offers more precise energy delivery