Ultherapy uses ultrasound targeting the 4.5 mm SMAS layer deep under your skin,...

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

Ultherapy uses ultrasound targeting the 4.5 mm SMAS layer deep under your skin, which is tough for RF or standard HIFU to reach. This makes it great for lifting over 3 to 6 months as your collagen rebuilds