XERF and Thermage FLX are monopolar radiofrequency systems; Ultherapy uses microfocused ultrasound. They differ in energy delivery and published evidence. No randomized head-to-head trial establishes that XERF gives better lifting, comfort, or durability than Thermage or Ultherapy. A consultation should compare the change you want, treatment area, safety, provider experience, and how outcomes will be judged.
What is the mechanical difference?
Cynosure Lutronic describes XERF as dual-frequency monopolar radiofrequency: 6.78 MHz and 2 MHz in one pulse, with surface cooling and adjustable settings. Solta Medical describes Thermage FLX as a monopolar radiofrequency system with different treatment tips and comfort features. Both aim to heat tissue without breaking the skin. Ultherapy uses focused ultrasound rather than radiofrequency; its own device labeling and clinical studies address specific treatment areas and uses. None of those descriptions tells you which device will best fit your face.
Dual-frequency monopolar RF. The XERF-specific human studies available to date are small and short-term, including a 39-person prospective study without a control group.
Monopolar RF with a longer product history and different tips. Its device evidence does not automatically transfer to XERF.
Microfocused ultrasound. An RF-versus-ultrasound result may inform the category, but not prove how this exact XERF protocol compares.
Has anyone directly compared these specific devices?
We found no randomized trial directly comparing XERF with Thermage FLX or Ultherapy. A 2019 split-face trial of 20 people compared a monopolar RF treatment with microfocused ultrasound for mild-to-moderate face and upper-neck laxity. Both sides improved over six months, with no statistically significant difference on the study’s main laxity measure. The RF arm was not XERF. It would be misleading to turn that result into “XERF equals Ultherapy.”
The 39-person XERF prospective study followed two XERF sessions through 90 days after the last treatment. It had no alternative-device arm. Even an attractive photograph or high satisfaction score in that paper cannot settle a head-to-head choice.
How do you choose a useful consultation question?
Begin with what you see: mild skin looseness, a fold, texture, or loss of facial volume. A device that heats tissue is not a substitute for a surgical lift or a treatment directed at a different cause. The AAD’s overview of skin-tightening options describes noninvasive outcomes as generally modest and gradual. Ask what scale of change the clinician expects for your own concern and why.
Then ask about the operator and plan. How does the provider choose treatment area and settings? How many visits are proposed? What are the likely short-term reactions? What does follow-up look like? If the provider offers only one device, ask when they would refer you for an alternative rather than suggesting that every concern fits the same machine.
What about pain, downtime, and “one treatment” claims?
Manufacturer descriptions are useful for understanding a device’s intended comfort features, not for guaranteeing that it will feel painless. Study protocols also differ: the XERF prospective group received two sessions, while another XERF report observed people after one. Do not infer that one brand always needs fewer visits or causes less discomfort than another from separate studies. Ask for the proposed plan and what happens if your skin is more sensitive than expected.
We arrange inquiries for XERF at a participating Garden City location; this site does not claim that the location offers Thermage or Ultherapy. Ask whether XERF fits
Sources and how to read them
We distinguish device descriptions, regulatory records, human clinical reports, and research on radiofrequency as a category. Findings in a small study or another device should not be treated as a prediction for one XERF patient.
- Cynosure Lutronic, XERF product information
- Solta Medical, Thermage FLX provider information
- Alhaddad et al., RF versus ultrasound split-face trial, 2019
- Weiss et al., prospective XERF study, 2026
- American Academy of Dermatology, skin tightening guidance
- FDA, XERF 510(k) K251327 record
Researched by Detroit Beauty Connect, September 27, 2026. Informational only; this page is not a diagnosis, a treatment plan, or a claim of clinician review. Ask the treating professional for advice specific to you.