Both HIFU and Thermage are non-invasive skin tightening treatments designed to improve skin laxity, firmness, and overall appearance by stimulating collagen production. HIFU is a non-invasive skin lifting and tightening treatment that uses focused ultrasound energy to stimulate collagen production in the deeper layers of the skin. Thermage is a non-invasive skin-tightening treatment that uses radiofrequency (RF) energy to stimulate your body’s natural collagen production. HIFU lifts deeper structures while Thermage tightens the skin.