Ultherapy uses ultrasound to target the 4.5 mm SMAS layer, making it popular...

https://super-wiki.win/index.php/Thermage_vs_10THERMA_%E2%80%93_Are_They_Both_Monopolar_RF%3F

Ultherapy uses ultrasound to target the 4.5 mm SMAS layer, making it popular for lifting deep tissue without cutting. RF heats skin to around 40-45°C to boost collagen, great for mild tightening