LinearZ concentrates focused ultrasound (HIFU) energy into a linear pattern and delivers it to the dermis and fascia layers. Where the energy reaches, thermal coagulation points are created in a continuous line, and as the tissue contracts, collagen regeneration begins. Because it fills in lines rather than dots, there are fewer gaps and the treatment time is relatively short. Through this process, the firmness of sagging cheeks, the jawline and the neck is refined.