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

https://www.slideserve.com/gierrepjfu/which-areas-can-ultherapy-treat-neck-brow-d-colletage-explained

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, reaching deep for lifting effects that build over 3 to 6 months. Compared to RF, which heats skin surface to 40-45°C for collagen tightening, Ultherapy penetrates deeper