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Fill-In Hair Extensions

Fill-in hair extensions are designed to add targeted fullness exactly where hair is naturally finer - whether you’re wearing them on their own or using them to top up a full-head set. Perfect for the front, sides and temple area, fill-ins help blend shorter layers, soften face-framing pieces and create a fuller finish without bulk. Milk & Blush fill-in hair extensions are lightweight, discreet clip-ins that integrate seamlessly with your own hair, so everything looks balanced, natural and effortlessly polished.

What are fill-in hair extensions?

Unlike traditional clip-in sets that add volume across the whole head, fill-in hair extensions are smaller, precision pieces you place exactly where you need them most: around the front hairline, the sides, or through the temple area for a subtle boost. This is why you’ll also see them described as micro fillers or micro filler clip-ins: they’re made for targeted coverage and a natural-looking blend, especially on fine hair.

They’re also brilliant for styling “problem zones” that can make hair look thinner than it is - like uneven face-framing layers, shorter bits around the front, or a choppy bob that needs a little extra fullness to look polished.

Who are fill-in hair extensions best for?

If you’ve ever wished you could add just a touch more hair here (without committing to a full set), this is for you. Fill-in hair extensions are ideal for:

  • Fine or thinning hair that needs a gentle, believable boost (especially around the front and sides).  
  • Sparse temples or a lighter hairline where volume can disappear in certain hairstyles.  
  • Blending shorter layers so your front pieces look fuller and more even.  
    nyone who loves a face-framing finish or a subtle “money piece” effect without a salon appointment.

Choose your fill-ins: Micro Fill-Ins vs Invisible Fill-Ins

Micro Fill-In Extensions (16” and 20”)

Our Micro Fill-Ins are intentionally light with extra small clips and natural density, designed to integrate discreetly into your own hair. Each pack includes 2 × 3” wefts, making them easy to place at the sides or front to fill and soften sparse areas.  They’re available in:

  • 16” Micro Fill-Ins (11g)  
  • 20” Micro Fill-Ins (15g)  

Both are made with 100% Remy human hair for a natural look and feel.

Invisible Fill-In Hair Extensions (18”)

If you want the most seamless finish around the front hairline, the 18” Invisible Fill-In Hair Extensions (30g) are ultra-discreet clip-in wefts designed specifically for targeted fullness around the front, sides and temples. They feature a flat “root mimic” base with injected hair so they sit flush for an invisible blend - with no glue, no bonds, and no damage.  

Each pack includes 2 × 3” pieces and they’re made with 100% Remy human hair.

How many packs do you need (and where should they go)?

One of the best things about fill-in hair extensions is that you can build your result gradually - one pack for subtle fullness, or a few packs for a more noticeable, face-framing boost.

As a guide:

  • Fine hair types: typically 1–2 packs
  • Medium to thick hair types: often 3–4 packs  

Placement tips that look natural:

  • Clip pieces at the front/sides to thicken face-framing layers.
  • Use around the temples to balance areas that can look sparse in ponytails or half-up styles.
  • Pair with a full set if you love overall length, but want the front to match the fullness through the mid-lengths.

 

Choose your fill-in type
Featured Products

Fill-In Hair Extensions FAQ

  • Are fill-in hair extensions good for thinning hair?

    Yes they’re designed for targeted volume in the areas that often show thinning first, like the front hairline, sides and temples. If you’re dealing with more noticeable top-of-head thinning, you may prefer a coverage-focused solution, but fill-ins are an excellent everyday option for subtle fullness.

  • Will fill-in hair extensions damage my natural hair?

    When applied correctly, clip-in fill-ins are a low-commitment way to add volume because they don’t use glue or bonds. Make sure clips are secured to a small section of hair (not slippery roots), and avoid placing them too tightly in the same spot every day.  

  • How do I choose between Micro Fill-Ins and Invisible Fill-Ins?

    Choose Micro Fill-Ins for a super-light, buildable boost and everyday blending of short layers. Choose Invisible Fill-Ins if you want a more “undetectable at the hairline” finish with that flush-to-the-scalp, root-mimic effect.

  • Can I wear fill-ins with a full set of clip-in extensions?

    Absolutely, fill-ins are perfect for topping up the front and sides so everything blends seamlessly, especially if your natural face-framing pieces are finer or shorter than the rest.

  • How many packs should I buy for a natural look?

    For most people, 1–2 packs gives a soft, believable boost (especially on fine hair). If your hair is thicker, or you want fuller face-framing layers, 3–4 packs can look more balanced.

  • Do you help with colour matching?

    Yes, if you’re unsure, use the Shade Match/colour match support so your fill-in hair extensions blend naturally with your own hair colour and tones.

Ready for targeted volume that still looks like your hair?

Milk & Blush fill-in hair extensions make it easy to add fullness exactly where you want it, whether you’re filling sparse areas, blending shorter front layers, or creating a softer, more youthful frame around the face. Choose 16” Micro Fill-Ins (11g), 20” Micro Fill-Ins (15g), or go ultra-discreet with the 18” Invisible Fill-In Hair Extensions (30g) - all made with 100% Remy human hair for a natural blend you can wear with confidence.

Hear from our Customers

At Milk & Blush, we believe great hair extensions should feel as good as they look. From subtle fill-ins to full-head sets, every piece is designed to blend seamlessly and give you confidence in your everyday style. With a wide choice of colours, lengths and targeted solutions, our collection makes it easy to find what works for your hair and how you like to wear it. Here’s what our customers have to say about their experience with Milk & Blush hair extensions.

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