XERF vs Thermage FLX: Which RF Lifting Suits You in Seoul?
How the two monopolar RF lifting devices differ in technology, comfort, treatment time and longevity, and how a doctor chooses between them.
XERF and Thermage FLX are both non-surgical monopolar radiofrequency treatments that heat deeper skin layers to tighten skin and stimulate collagen. XERF combines two frequencies (6.78 MHz and 2 MHz) and sessions usually take about 20–40 minutes, while Thermage FLX uses a single 6.78 MHz frequency, has a longer clinical track record and sessions often take 45–90 minutes. Neither device is universally better; the right choice depends on your skin laxity, anatomy and goals.
Quick comparison table
| Feature | XERF | Thermage FLX |
|---|---|---|
| Technology | Dual-frequency monopolar RF | Monopolar RF |
| RF frequency | 6.78 MHz + 2 MHz | 6.78 MHz |
| Main goal | Skin tightening, collagen stimulation, facial contouring | Skin tightening, fine-wrinkle improvement, collagen remodeling |
| Cooling / comfort | Multi-level contact cooling with real-time impedance monitoring | Integrated cooling with vibration (Comfort Pulse) |
| Treatment time | About 20–40 minutes | About 45–90 minutes |
| Downtime | Usually minimal (temporary redness or swelling) | Usually minimal (temporary redness or swelling) |
| Typical maintenance | Every 6–12 months | Every 12–18 months, varies by patient |
Figures are typical ranges; your own plan depends on your skin and the doctor's assessment.
How both treatments work
Both devices deliver controlled radiofrequency heat into the deeper layers of the skin. The heat contracts existing collagen and starts a healing response that builds new collagen and elastin over the following weeks and months, improving firmness, elasticity and facial definition. Neither requires surgery, incisions or stitches.
XERF uses two frequencies: 6.78 MHz for more superficial dermal tightening and 2 MHz for deeper heating, combined with real-time impedance monitoring, automatic energy adjustment and multi-level cooling to spread heat evenly. Thermage FLX is a long-established single-frequency monopolar RF system with a large treatment tip for broad coverage, vibration and integrated cooling, and many years of worldwide clinical use.
Real result: Thermage FLX
Example of a Thermage result from a Nest Clinic patient; individual results vary.
Which is more comfortable?
Comfort varies from person to person. Many patients describe XERF as comfortable for a monopolar RF treatment, which is attributed to its cooling and more even energy delivery. Thermage FLX is considerably more comfortable than earlier Thermage generations, although some patients still notice stronger heat sensations. At Nest Clinic topical numbing cream is applied before either treatment and the energy level can be adjusted during the session. See Is XERF painful? for more detail.
Which gives better lifting?
Both stimulate collagen effectively, and neither is universally better. A doctor may lean toward one based on your concerns:
- XERF may suit: early to moderate laxity, jawline definition and facial contouring, patients who prioritise comfort and shorter sessions, and preventive anti-aging.
- Thermage FLX may suit: general skin tightening, fine wrinkles, and patients who already respond well to Thermage and want to continue maintenance.
For deeper SMAS-level lifting, a doctor may instead discuss focused ultrasound such as Ultherapy, or a combination.
How long do results last?
XERF: improvement develops progressively over about 2–3 months, and results typically last around 6–12 months, so many patients plan maintenance roughly once a year.
Thermage FLX: improvement builds gradually over several months, and results often last around 12 months or longer in some cases.
Longevity in both cases depends on age, natural collagen production, lifestyle, sun exposure and skin quality.
Treatment areas and choosing at Nest Clinic
Both devices can treat the face, cheeks, lower face and jawline, neck, double chin caused by loose skin and, with appropriate tips, the area around the eyes. At Nest Clinic in Gangnam, a doctor examines your skin quality, degree of laxity and facial anatomy before recommending XERF, Thermage FLX or a combination, together with the right shot count. The clinic is about 1 minute from Sinnonhyeon Station Exit 7 (7–10 minutes' walk from Gangnam Station).
Reviewed by Dr. Joo Sohee
Representative director of Nest Clinic Gangnam, a doctor-led aesthetic clinic with a female medical team that treats local and international patients. This page is reviewed for medical accuracy; it is general information, not a diagnosis. Treatment plans are decided after an in-person consultation.
Clinic treatment counts as reported by Nest Clinic. About the clinic
Frequently asked questions
Is XERF better than Thermage?
Neither is universally better. XERF uses two RF frequencies and shorter sessions, while Thermage FLX has a longer clinical track record; the best choice depends on your skin laxity, anatomy and goals.
Is XERF less painful than Thermage?
Many patients find XERF comfortable thanks to its cooling and even energy delivery, but comfort varies. Numbing cream is used for both treatments and energy can be adjusted during the session.
Which lasts longer, XERF or Thermage?
Thermage FLX results often last around 12 months or longer, while XERF results typically last about 6–12 months. Individual longevity depends on age, collagen production and lifestyle.
Is there downtime after XERF or Thermage?
Downtime is usually minimal for both. Temporary redness, warmth or mild swelling can occur and usually settles within hours to a few days.
Can I combine XERF or Thermage with other treatments?
Yes. A doctor may combine RF lifting with ultrasound lifting, skin boosters or injectables depending on your goals; timing is planned during consultation.
Related treatments
Not sure whether XERF or Thermage fits you?
Send us a photo and your goals — a doctor reviews it and our English-speaking coordinator replies with a personalised plan and price.
4F–5F Seocho Building, 453 Gangnam-daero, Seocho-gu, Seoul
1-min walk from Sinnonhyeon Station Exit 7 (Line 9)
7–10 min from Gangnam Station Exit 10/11
+82-10-4843-2867
