Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper...

https://cruzqmfp756.theburnward.com/does-ultherapy-hurt-and-what-affects-comfort

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper lift compared to standard HIFU, which usually targets 1.5 to 3 mm skin layers. Radiofrequency heats tissue to around 40-45°C to boost collagen more superficially