Youth · Comfortable RF Lifting
Coolfase: Cooled Radiofrequency at 6.78MHz
Coolfase delivers 6.78MHz radiofrequency while cooling the skin surface in real time. The dermis reaches 40 to 60°C and rebuilds collagen; the surface stays cool, so most people need no anaesthetic.
onlif-youth-coolfase-hero-side-01.jpg · patient portrait, calm, natural light · 1200×1500 · AI OK
Quick Answer
What is Coolfase?
Radiofrequency at 6.78MHz heats the dermis to 40-60°C while a cooling system chills the surface. Because the surface is protected, the setting follows what your skin needs rather than what you can tolerate.
In Brief
Radiofrequency heat, applied evenly across the skin.
Coolfase uses unipolar radiofrequency at 6.78MHz. The energy passes into the dermis and heats it to between 40 and 60°C, which is the range that makes collagen contract and then rebuild. A patented cooling system holds the epidermis cool at the same time, so the heat you would normally feel at the surface is largely removed.
Pillar
Lifting
Type
Radiofrequency
Often chosen for
Crepey or loose skin, eye area
vs. Thermage
Cooled surface, so no numbing cream needed
Rhythm
2-3 sessions, 3-6 months apart
Compare with
Thermage · CoolSoniq · Alltite
Understanding It
Two Causes of Looseness, Treated Differently
onlif-coolfase-anatomy-01 · illustration of the three skin layers · 1000×1100 · AI OK
Because the surface is protected, the energy does not have to be dialled down to keep the treatment bearable. On a conventional RF device the limit’s usually what the patient can tolerate, not what the skin needs. That’s the argument for this one, and it’s worth weighing rather than taking on trust.
A Fair Question
“If it does not hurt, is the energy high enough?”
The cooling changes what the surface feels, not what reaches the dermis. If anything the energy can be held higher than on a device where comfort sets the ceiling. That said, comfort is not evidence of effect, and we judge the result on photographs at three months rather than on how the session felt.
How It Works
Plan. Cool. Rebuild.
The surface stays cool while the dermis heats.
01
First, the energy plan is drawn for your face
Skin thickness, where firmness has gone, and which areas should be left alone. Energy is kept away from places prone to hollowing and concentrated where support is actually needed. If the problem is the deep layer rather than the skin, we’ll say so and recommend something else.
onlif-coolfase-mod-01 · assessment · 1200×900 · AI OK
02
Then, cooled delivery, area by area
The handpiece cools the surface as it delivers 6.78MHz energy into the dermis at 40 to 60°C. The setting is adjusted per area rather than run at one level across the face. Most people need no anaesthetic, and the session takes about half an hour.
onlif-coolfase-mod-02 · cooled handpiece on skin · 1200×900 · AI OK
03
Then, collagen rebuilds over two to three months
There is an immediate tightening on the day, but that is tissue response rather than the result. Collagen rebuilds over two to three months, and the effect accumulates across two or three sessions spaced three to six months apart. We compare photographs at three months rather than judging it on the day.
onlif-coolfase-mod-03 · timeline · 1200×900 · AI OK
onlif-device-coolfase.webp | Coolfase unit, full height, cut-out on white, portrait | 900x1200 | ONLIF SUPPLIES
The Device
Coolfase
Technology unipolar radiofrequency, 6.78MHz, with real-time surface cooling
Dermal temperature 40-60°C
Session usually without anaesthetic; no downtime
Course 2-3 sessions, 3-6 months apart
We use genuine handpieces and consumables, and the cooling system is checked before each session. You are welcome to ask to see the equipment before treatment.
Candidacy
Who It May Be For
— You’ve looked at lifting treatments before and put it off, mostly because of what people say about the pain.
— Your skin is on the thin or sensitive side, and treatments other people describe as fine have not felt fine to you.
— It isn’t just one thing — firmness, pores and fine lines have crept up together, and you’d rather not treat them one at a time.
— You’ve got something on the next day, and turning up red isn’t an option.
The Visit
What to Expect
01
Assess
Doctor-led consultation across all four pillars.
02
Plan
Where your looseness lives, answered first,.
03
Treat
Measured, even warmth across your planned map. Cooled delivery at 6.78MHz, area by area, usually without anaesthetic.
04
Care
Early tightening, then months of quiet building. Wash with lukewarm water and use sun protection for the first three days. There’s usually no bruising or swelling.
Planning
Commonly Planned Together
Lifting
If both layers need attention. Deep and surface, in the right order.
Youth
For the eye area specifically, inside our careful eye-area approach.
Texture
Better skin quality alongside better firmness.
Whether you need one or two is something we work out after looking, not before.
Honest Alternatives
If Something Else Fits Better
Layer by Layer
Cool Outside, Warm Inside
Radiofrequency has to cross the surface to reach the layer that matters. Cooling the surface is what lets the energy stay high without the treatment becoming unbearable.
| Layer | What the device does | Why it matters |
|---|---|---|
| Epidermis, the surface | Cooled in real time as the energy passes through | This is where the pain of radiofrequency is normally felt. Cooling it is what removes the need for anaesthetic. |
| Dermis | Heated to 40–60°C | The range at which collagen contracts and then rebuilds. This is the part that produces the result. |
| Subcutaneous tissue | Unipolar energy spreads through the deeper layer | Supports the structure underneath rather than treating the surface alone. |
Key Points
What to Take Away
- Coolfase is unipolar radiofrequency at 6.78MHz with a patented real-time cooling system.
- The dermis is heated to 40-60°C, the range that contracts collagen and prompts it to rebuild; the epidermis is cooled at the same time.
- Most people need no anaesthetic, and there’s no epidermal damage, so you can return to normal the same day.
- Because the surface is protected, the energy does not have to be reduced for comfort.
- It works on firmness, pores and fine lines together rather than one at a time.
- Tightening is felt immediately; the collagen response builds over two to three months.
- Usually two or three sessions, three to six months apart.
- Wash with lukewarm water and use sun protection for the first three days.
FAQ
Questions People Ask
For most people, yes. The cooling system holds the skin surface cool while the energy passes through it, which removes most of the sensation. You’ll feel warmth building. Tell us if you’re sensitive and numbing cream can still be arranged.
This is the right question to ask. On a conventional radiofrequency device the energy is often limited by what the patient can tolerate. Here the surface is protected, so the setting is chosen for the skin rather than for comfort. Comfort is still not evidence of effect, which is why we compare photographs at three months.
There is an immediate tightening on the day. The collagen response builds over two to three months, and accumulates across a course.
Usually two or three, spaced three to six months apart. Your doctor will give you a number at consultation rather than an open-ended plan.
Usually none. Because the epidermis is not damaged, you can return to normal activity immediately. Wash with lukewarm water and use sun protection for three days.
Both are radiofrequency and both work on the skin rather than the deep support layer. Thermage is a single stronger session repeated about once a year, and most people need numbing cream. Coolfase is more comfortable and repeated more often. Neither is better; they suit different people and different schedules.
Further reading: Ultherapy vs Thermage vs HIFU: which lifting treatment does what
Assessment Comes First
Whether this device suits you, or something else would work better, depends on a doctor examining your skin first. Onlif Clinic is in Seocho-gu, Seoul.