Recommended with Fusion
Ultimate Straight Leave-In
A 4-in-1 leave-in made for Keratin and Plex straightened hair: pH rebalancer, heat protection, frizz protection and natural ingredients.
Our most advanced treatment · Only at Terreamer
Ultimate Keratin Plex Fusion Straightening
Premium Keratin and Plex Nanoplasty in one visit, repairing your hair inside and out. Our straightest, longest-lasting result: up to 8 months. St Kilda Road, Melbourne. From $1,125 $845.
- 4.8 from 365 Google reviews
- 30-Day Happy Hair Guarantee, only at Terreamer
- Afterpay and Zip
- 50% off your 2nd treatment · Offer applies to Fusion Straightening
Ultimate Fusion at a glance
- Lasts
- Up to 8 months
- In the chair
- From 3 hrs
- Price
- From
$1,125$84550% off your 2nd treatment · Offer applies to Fusion Straightening - Downtime
- None
- Formula
- Vegan, formaldehyde-free
In short
What is Ultimate Fusion?
Terreamer's most advanced hair straightening treatment, in six answers.
-
What it is
Premium Keratin and Plex Nanoplasty, combined with our own Fusion technique in one visit.
-
What it repairs
Inside and out: the outer layers and the inner bonds.
-
Who it's for
Thick, resistant, bleached or over-processed hair, every texture including 4c.
-
Two versions
Straightening or Repair, same price, chosen with you at your consultation.
-
Your mornings
Styling goes from about 45 minutes to about 5.
-
Where
Only at Terreamer, St Kilda Road, Melbourne. We developed the Fusion technique in our salon and keep it in-house.
Real results
Ultimate Fusion before and after, from our salon
Every result here is a real Terreamer Ultimate Fusion client, photographed in our salon before and after their treatment. We shoot from behind, so you see the hair, not the face.
-
Thick and resistant to smoothThick, coarse hair -
Bleached and dry to strong and smoothBleached hair · Fusion Repair -
Coily to straightCoily, afro-textured hair -
Curly to straightCurly hair
Results vary with hair type and lifestyle. Want to know what to expect for yours? Text us a photo.
What clients say
What our Ultimate Fusion clients say
Real Google reviews from clients who had Fusion with us, copied word for word.
-
Ultimate Fusion
I got the fusion treatment done in Feb 2025 (almost a year ago) and wanted give a review about the longer term results. I got it a few weeks before my delayed honeymoon to Thailand, and it was LIFECHANGING for me. I was able to swim multiple times a day for two weeks straight and my hair would just dry nicely. It also was able to stay nice despite the humidity! Normally my hair immediately turns into a giant frizz ball that cannot be tamed no matter how much I straighten it anywhere humid. I continued to notice these benefits for months after, through Melbourne winter.
The other main difference I noticed was my hair finally grew longer over time, due to no longer breaking as much at the ends.
Ruby Smith 
Google review, 5 stars, January 2026 -
Ultimate Fusion
All I can say is OMG... I have never been so impressed or blown away by a hair treatment in my life!! I got the fusion Plex/Keratin treatment and have just washed my hair for the first time since the treatment. I have let it air dry and it literally looks like I have been to the salon for a blow wave. My hair is so sleek, shiny and smooth.
Syd Zygier
Google review, 5 stars, February 2026 -
Ultimate Fusion
I received a fusion straightening treatment about two weeks ago from Sandra, and could not be happier with the results! My hair was super bleach damaged and frizzy prior to my treatment, and now feels so much healthier and dries straight with no effort at all. Sandra was so lovely and enjoyable to chat to!
ClaireBleach damaged
Google review, 5 stars, August 2024 -
Ultimate Fusion
Fusion treatment complete repair. I would recommend for 4c hair
MK Keza4c hair
Google review, 5 stars, August 2026
Inside and out
Two treatments. Every layer that needs repair.
Your hair has three layers. A single treatment repairs one of them well. Ultimate Fusion repairs both of the layers that bleach, heat and humidity damage.
Inside a single strand of hair
Cut-away view · not to scale- Premium Keratin repairs layer 1
- Plex Nanoplasty repairs layer 2
- Ultimate Fusion repairs layers 1 + 2
-
Cuticle · the outer shield
Premium Keratin smooths and seals it, with Glyoxyloyl Carbocysteine and Keratin Amino Acids. Shine, frizz control and straightness come from here.
-
Cortex · strength, bonds and shape
Plex Nanoplasty repairs the bonds inside the hair, the part bleach and heat break. Strength comes from here.
-
Medulla · the soft core
Left as it is.
Two versions, one price
Choose your Fusion
Both are two premium treatments in one visit, at the same price. We choose with you at your free consultation, every visit. Not sure which? Text us a photo of your hair and we'll tell you honestly.
Fusion Straightening: Premium Keratin + Plex Nanoplasty
For thick, coarse or resistant hair that wants to be as straight as it can go. A double straightening: our straightest result.
Frizz control very high · Straightening very high · Repair high
Fusion Repair: a straightening treatment + Plex Repair
For bleached, foiled or over-processed hair that needs its strength back first. Plex Repair is a bond-building treatment that rebuilds strength inside the hair before it is straightened.
Frizz control high · Straightening high · Repair very high
Who it's for
Is Ultimate Fusion right for your hair?
Fusion is for hair that needs more than one treatment can give: the straightest result, the most repair, or both, and the longest time between visits.
It suits you if
- Your hair is thick, coarse or resistant, and other treatments haven't fully straightened it
- It's bleached, foiled or over-processed, and needs its strength back as well as smoothing
- It's curly, coily or afro-textured, including 4c
- Humidity, travel or swimming undo your hair, and you want it to hold
- You want the longest-lasting result we offer, up to 8 months between visits
Another treatment may suit you better if
- Your hair is in good condition and only the outer layers need repair Premium Keratin, from $565
- It's bleached or damaged, but one treatment is enough Plex Nanoplasty, from $565
- You want to keep your wave and lose the frizz Express Smoothing, from $395
We'd rather tell you a single treatment will do than sell you a Fusion you don't need. Text us a photo and we'll tell you honestly.
Who will do your hair
This is the only thing we do.
Sandra Issa and Peter McGuinness co-founded Terreamer in 2013. Smoothing, straightening and repairing hair is all we've done since, with formulas we developed ourselves. A Fusion is our longest appointment, so it's never rushed: two treatments, one small section at a time.
Your appointment
Your Fusion, step by step
Allow from 3 hours. Longer or thicker hair takes longer.
-
Free consultation
We look at your hair, ask about bleach and colour, choose Straightening or Repair with you, and confirm your price before we start.
-
A deep-cleansing wash
Clears away build-up so both treatments can soak in.
-
Plex Nanoplasty, inside
We apply Plex Nanoplasty to repair the inner layer and bonds, leave it to process, then rinse out the excess.
-
Premium Keratin, outside
We apply Premium Keratin to smooth and repair the outer layers.
-
Dry and seal
We blow-dry your hair, then seal both treatments in with a flat iron, one small section at a time.
-
Ready to go
No downtime. Wash it and tie it up whenever you like. Wait 48 hours before swimming.
After your appointment
There's no downtime, so you can wash your hair and tie it up straight away. Wait 48 hours before swimming in the pool or the ocean. To keep your Fusion smooth for as long as possible, use Terreamer salt-free shampoo and conditioner and our Ultimate Straight Leave-In. See the aftercare we recommend.
Price and booking
What Ultimate Fusion costs
From $1,125 $845Short hair · 50% off your 2nd treatment · Offer applies to Fusion Straightening
A Fusion is two premium treatments, so it's priced as two. Right now the second one is half price: 50% off your 2nd treatment, for Fusion Straightening. Spread the cost with Afterpay or Zip.
Your mornings, back. Styling typically goes from about 45 minutes to about 5. If you style every day, that's around 160 hours back over eight months. If it lasts the full 8 months, that's about $105 a month.
Your price depends on your hair pattern, how much hair you have and its length. We confirm it at your free consultation, before we start, so there are no surprises.
| ShortTo your ears | |
|---|---|
| MediumJust above the shoulder | |
| LongShoulder to mid shoulder blade | |
| Extra longMiddle of the back | |
| Men's Ultimate FusionShort to extra long | From |
Where you sit in each range depends on your curl and how much hair you have. Offer prices are 50% off your 2nd treatment, for Fusion Straightening.
Book with a $197 deposit
The deposit holds your Fusion and comes off your treatment price.
Need to change? Give us at least 48 hours' notice. With less notice, the deposit can't be refunded.
Backed by our 30-Day Happy Hair Guarantee, only at Terreamer.
Pay your deposit online, and the rest in the salon by card, cash, Afterpay or Zip (for Zip, let us know before your appointment). Prices include GST.
Included
Free consultation and hair assessment
Plex Nanoplasty and Premium Keratin (or Plex Repair) in one visit
Blow-dry and finish
Aftercare advice
Our 30-Day Happy Hair Guarantee
Not included
Colour or toning
Take-home products
A cut or restyle
Our promise
If it isn't right, we make it right.
Every Ultimate Fusion comes with our 30-Day Happy Hair Guarantee: our own promise, only at Terreamer. Before you pay a cent, we tell you what we can promise for your hair. If your hair isn't behaving the way we said it would within 30 days, come back in and we'll make it right.
This is on top of your rights under Australian Consumer Law.
Compare
Ultimate Fusion or a single treatment?
All four smooth frizz and are formaldehyde-free. Here's how they differ.
| Express Smoothing | Premium Keratin | Plex Nanoplasty | Ultimate Fusion (this page) | |
|---|---|---|---|---|
| What it repairs | Smooths the cuticle, with collagen and hydration for shine | The outer layers | The inner layer and bonds | Inside and out |
| Best for | Keeping your wave, losing the frizz | Natural or coloured hair in good condition | Bleached, foiled or heat-damaged hair | Repair and our longest-lasting result |
| Lasts | Up to 3 months | 4–6 months | 4–6 months | Up to 8 months |
| In the chair | From 1.5 hrs | From 2.5 hrs | From 2 hrs | From 3 hrs |
| From | $395 | $565 | $565 |
What's in it
Two of our own formulas, both formaldehyde-free
Premium Keratin
Glyoxyloyl Carbocysteine and Keratin Amino Acids, to smooth and repair the outer layers.
Plex Nanoplasty
Bromelain, an enzyme from pineapple that clears build-up; Cysteamine HCl, the straightening agent; our Plex bond builder; collagen; silk amino acids; natural oils and butters. A vegan formula.
Has it been tested?
Both are developed with a leading Colombian laboratory and independently tested in Australian laboratories. Ask us and we'll send you the test certificate.
Who should check first?
If you're pregnant or breastfeeding, please check with your doctor and follow their advice. Clients need to be 8 or older.
Ultimate Fusion questions, answered
Updated October 2026
If your hair needs both kinds of repair, or the straightest result, yes. You get two treatments in one visit and our longest-lasting result, up to 8 months.
If one treatment will do, we'll tell you at your free consultation. Compare all four treatments.
Fusion Straightening is Premium Keratin plus Plex Nanoplasty, our straightest result. Fusion Repair is a straightening treatment plus our Plex Repair bond-building treatment, for hair that needs its strength back first.
They cost the same. We choose with you at your consultation, every visit.
Up to 8 months. It's semi-permanent and wears out gradually, so there's no hard line.
New growth comes through as your natural texture.
Your price sits inside the ranges above, depending on your hair pattern, how much hair you have and its length. We confirm the exact figure at your free consultation, before we start.
Text us a photo first and we'll tell you beforehand.
Yes. Your $197 deposit comes off the price, and you can pay the rest in the salon with Afterpay or Zip. For Zip, let us know before your appointment.
We adjust the iron temperature and use violet pigments to manage brassiness. It's a Terreamer salon method.
Bleached hair can still shift tone a little, and we'll tell you honestly what to expect at your free consultation.
Yes. Ideally leave 48 hours and two hair washes between them.
Bleach always goes before your treatment, and toner or colour after, because the treatment can lift artificial tone, not your natural colour. Have toner or colour done by us, or check with us first.
Yes, every texture, including 4c. We assess your hair at your free consultation and choose Straightening or Repair with you.
Wash it and tie it up straight away. There's no downtime. Wait 48 hours before swimming in the pool or the ocean.
After that, protect your hair before a swim with Intensive Rescue Therapy or Hair Protector Leave-In, and rinse afterwards.
Fusion uses two of our own formulas, chosen for your hair at the consultation, and it comes with our 30-Day Happy Hair Guarantee.
Terreamer salt-free shampoo, conditioner and mask, from our Pure Hydration or Deep Fortifying range. Keep your hair hydrated too. Our Ultimate Straight Leave-In is recommended with Fusion.
Yes, from $675 $510, priced for men's hair. That's with 50% off your 2nd treatment, for Fusion Straightening. See men's treatments.
We're on the ground floor at Shop 2, 456 St Kilda Rd, Melbourne, near South Yarra. We're appointment only, so please book or text us first.
Secure Parking at 416 St Kilda Rd is $20 for the day. There are 2-hour meters in the St Kilda Rd median and 1-hour meters out the front, both $4 an hour, and parking outside is free on weekends. By tram, use stop 23, Arthur St/St Kilda Rd (routes 3, 5, 6, 16, 64, 67 and 72).
Still deciding?
Book your Ultimate Fusion, or ask us first.
Send 2–3 photos of your hair in daylight: front, back and the ends, and tell us about any bleach or colour in the last few months. We'll tell you honestly which Fusion suits it and confirm your price, usually within minutes. Your Fusion also comes with our 30-Day Happy Hair Guarantee.
Aftercare we recommend
Keep your Fusion smooth at home
A Fusion lasts longest with a sodium chloride (salt) free shampoo and conditioner, and a leave-in that protects it from heat and frizz. These are our own, made for Keratin and Plex straightened hair.
Deep Fortifying Shampoo & Conditioner
Strengthening and smoothing, for weak and damaged hair. With keratin and argan oil. Salt-free, safe for Keratin and Nanoplasty.
Pure Hydration Shampoo & Conditioner
Intense moisture and nourishment, for normal to dry hair. With argan oil and amino acids. Salt-free, safe for Keratin and Nanoplasty.
Free shipping in Australia over $100, or pick them up at your appointment. Not sure which range suits you? We'll tell you at your consultation.