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

https://trulyexpatlifestyle.com/non-surgical-skin-tightening-in-singapore/

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