Protein Leave-in Treatment
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Protein Leave-in Treatment
Protein Leave-in Treatment
Hair is made up of around 90% protein. Over time, that structure weakens, leading to breakage, frizz and loss of shape. This lightweight leave in treatment feeds your hair with the proteins it needs to stay strong, elastic and healthy. Waves feel more resilient, smoother and easier to manage, with less breakage and fewer split ends over time. 150ml
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- Delivered in 2–3 business days
BENEFITS
BENEFITS
- Strengthens weakened strands to reduce breakage and frizz
- Improves elasticity so waves feel bouncier and more defined
- Best when used occasionally when you feel like your hair needs it
- Formulated with powerhouse ingredients like hydrolysed wheat protein (strengthens hair by penetrating the shaft and improving elasticity, repairing damage and adding body and structure to wavy hair), panthenol (adds moisture and shine, also helps make hair more resilient to breakage), and castor oil (a powerful anti-frizz ingredient with lightweight smoothing properties)
- Silicone, sulphate and paraban free
- Safe for coloured or bleached hair
INGREDIENTS
INGREDIENTS
Aqua (Water), PVP, Polyquaternium-37, Hydrolyzed Wheat Protein, Panthenol, Benzyl Alcohol, Sodium Benzoate, Propylene Glycol Dicaprylate/Dicaprate, PPG-1 Trideceth-6, PEG-60 Hydrogenated Castor Oil, Potassium Sorbate, Glycerin, Linalool, Parfum (Fragrance).
SHIPPING & DELIVERY
SHIPPING & DELIVERY
All orders are processed within 1 to 2 business days (excluding weekends and holidays).
UK Mainland Orders - FREE Over £60
All orders are processed within 1 to 2 business days (excluding weekends and holidays) after receiving your order confirmation email. You will receive another notification when your order has shipped.
Free shipping on all orders over £60 to UK mainland (does not include Northern Ireland).
Orders under this threshold cost £4.
Next Day Delivery - £7
We also offer Next Day Delivery for UK mainland orders at £7. Orders must be placed before 1pm (Monday to Friday) to be eligible for next working day delivery.
Orders placed after 1pm, on weekends or on bank holidays will be dispatched the next working day. Next Day Delivery is available on UK mainland orders only and does not include Northern Ireland.
Europe Orders - FREE over €70
Orders under this threshold will cost €10.
Does not include local taxes.
Delivery time is 5 business days.
Australia Orders - FREE over $155
Orders under this threshold will cost $12.
Delivery time is 7-14 business days.
Canada Orders - FREE over $120
Orders under this threshold will cost $17.
Delivery time is 7 business days.
Tracking
When your order has shipped, you will receive an email notification from us which will include a tracking number you can use to check its status. Please allow 48 hours for the tracking information to become available.
If you haven’t received your order within 10 business days of receiving your shipping confirmation email, please contact us at hello@merwave.co.uk with your name and order number, and we will look into it for you.
Once an order is placed we are unable to make any amendments.
This includes order details, like adding products, and also altering your shipping address. You may be able to amend your address using the courier self service options once your order has been despatched. In this instance, we'd recommend proceeding with your order and returning any items you no longer wish for.

Before + After
Check our these real life results, using the Merwave range.
What’s inside
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HYDROLYSED WHEAT PROTEINHYDROLYSED WHEAT PROTEIN
Strengthens hair by penetrating the shaft to help improve elasticity, repair damage and add body and structure to wavy hair.
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CASTOR OILCASTOR OIL
Powerful anti-frizz ingredient with lightweight smoothing properties.
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PANTHENOLPANTHENOL
Penetrates the hair shaft, helping wavy hair retain bounce and softness, leaving it looking defined and feeling healthy.
How to use The Protein Leave-in Treatment
“Years of bleaching and heat styling left my waves weak, snapping and totally lifeless. Hair needs protein to stay strong and elastic, so I created a treatment that was able to repair damage and bring back bounce waves in an instant!”
Our mission
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Real ResultsReal Results
Zero hair retouch, authentic results from products that are tailor-made specifically to care for wavy hair
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Forever LightweightForever Lightweight
Focussed on thoughtfully-sourced ingredients for formulas that never weigh down waves
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CREATING COMMUNITYCREATING COMMUNITY
It’s not just a routine, it’s a lifestyle. Proudly celebrating connection - making waves with over 160,000 and growing!
You + Merwave
Our Merwave community is our heartbeat; see how they shape & inspire us
Customer Reviews
As part of my menopause journey I developed wavy hair ! It was a shock I have to say but once I’d discovered products to help I’ve now embraced my new look and honestly recommend your products . For me they work better than any others I’ve tried .
massively over priced and leaves your hair feeling crispy and awful rather than soft bouncy curls.... you don't need 5 products to get the soft curls. if you want crispy 90's style gelled hair that doesn't move then this is for you.
Will use the rest of the box
Having tried a wide range of other wavy hair products over the years I find Merwave the best.
I have very fine hair with a mixture of waves and curls and the range has helped keep them soft but defined. I am particularly fond of the shampoo, conditioner and mask. The wave cream is fabulous and works for me with the gel.
A fan👍