100% Cotton Dust Mite Quilt Protector & Doona Encasement

A 100% cotton dust mite encasement for your quilt or doona — tightly-woven cotton with a measured pore size of 2.8 microns. OEKO-TEX Standard 100 certified, zippered closure. Available Single, Double, Queen, King, and Super King.

At a glance

• Fabric: 100% cotton
• Pore size: 2.8 microns at maximum distribution — independently tested by capillary flow porometry (Galwick fluid).
• Seams: Enclosed binding for continuous barrier integrity
• Closure: Single-side zipper along one short end of the encasement
• Coverage: Encloses the doona on all sides
• Certification: OEKO-TEX Standard 100 (tested for over 100 substances of concern)
• Includes: 4 internal quilt clamps to keep doona corners in place
• Care: Machine washable, tumble-dry on medium heat
• Quality: Manufacturer-backed against defects

What this product is

A full encasement that seals your existing doona inside a tightly-woven cotton barrier — can be used in households where dust mite allergens are a concern.

• Why this matters for dust mite allergens. Dust mite allergens are carried by fecal pellets and body fragments that typically measure 10 to 40 microns. Doonas are a major dust mite allergen reservoir on the bed because of their volume and the daily skin-cell shedding they collect. This encasement's 2.8-micron weave traps these allergen-carrying particles inside the doona.
• Use alongside mattress and pillow encasements. A quilt encasement covers one of three main allergen reservoirs on a bed. Many households fit all three together as part of a broader dust mite allergen reduction approach.
• How to fit it. Slide your doona inside, attach the corners with the four clamps, close the zipper, then your normal quilt cover goes over the top.

A note on Australian terminology: "quilt cover," "doona cover," and "duvet cover" all refer to the same thing — different words for the same product. We use "doona" and "quilt" interchangeably below.

Who this is for

This encasement is commonly chosen by:

• Households setting up dust mite barrier bedding across the main bed layers (mattress, pillow, quilt)
• People setting up an allergen-aware bedroom alongside mattress and pillow encasements
• People who prefer 100% cotton bedding without polyurethane laminates or synthetic fibres
• Households who want a fully sealed quilt encasement that also functions as a barrier to bed bugs

It's probably not the right fit if:

• You're looking for a decorative quilt cover — this is a barrier layer that goes under your normal quilt cover
• You need waterproof protection — see our waterproof quilt protector instead
• You need an infant cot size — we don't currently offer this product for cot use

What the fabric does

Dust mite allergens are carried by fecal pellets and body fragments that typically measure 10 to 40 microns. This fabric tests at 2.8 microns at maximum distribution, well below that.

• Tightly-woven cotton barrier. Particles inside your doona stay inside, rather than passing through to the air around you.
• Enclosed binding seams. Fabric edges are sealed within a binding strip so the barrier extends from corner to corner without a gap — important because in barrier products, an open seam is the weak point.
• Zippered closure. A zip running along one short end of the encasement seals the doona inside.
• Breathable. Woven cotton, not laminated plastic — no heat trap, no "crinkle" feel. Washes and dries like normal bedding.

Test method: capillary flow porometry using Galwick fluid, conducted by an independent third-party lab.

Sizing

Cotton has minimal stretch, so order based on your doona's actual dimensions. Encasements are sized slightly larger to allow for normal wash shrinkage.

Tip: Measure your existing doona before ordering. If you're between sizes, size up — a slightly loose encasement is easier to fit than a tight one.

How to fit it

1. Open the zipper along the short end of the encasement.
2. Lay your doona flat and slide it inside the encasement through the open end.
3. Use the four internal quilt clamps to attach the corners of your doona to the corners of the encasement (this stops the doona bunching when you wash or move it).
4. Close the zipper to seal the encasement.
5. Put your normal quilt cover, sheet, or doona cover over the top.

Care

• Wash: Machine wash in warm or hot water. 60°C is the temperature most commonly cited for dust mite reduction in bedding, where the care label allows.
• Dry: Tumble dry on medium heat or air dry. Avoid high heat — repeated hot drying can shrink cotton.
• Frequency: Every 6 months is generally sufficient when a normal sheet or quilt cover sits on top to absorb daily wear. The decorative cover above gets washed weekly with your bed linen; the encasement underneath stays cleaner for longer.
• Avoid: Bleach, fabric softeners, and dry cleaning.

Certification and testing

• OEKO-TEX Standard 100 — an independent global certification confirming the textile (including thread, zipper, and fabric) has been tested for over 100 substances of concern.
• Independent fabric testing — pore size of 2.8 microns at maximum distribution, measured by capillary flow porometry using Galwick fluid by a third-party lab.

We don't make claims that the product cures, treats, or prevents allergies, asthma, or any medical condition. What we describe is the fabric's measurable physical properties as a barrier against fine particles.

Pairs well with

For a complete bedding setup, customers commonly pair this with:

• Dust mite mattress encasements — covers the mattress itself
• Dust mite pillow protectors — one per pillow

A complete allergen-aware bedroom uses all three barrier layers — mattress, pillow, and quilt. For more on setting this up, see our guide to dust mite barrier bedding.

Frequently asked questions

Will this fit my doona?

Cotton has minimal stretch, so measure your doona's actual dimensions and order the closest matching size. Encasements are sized slightly larger for normal wash shrinkage, so a near-match works well.

What's the difference between a quilt cover and a quilt encasement?

A regular quilt cover (or doona cover) is decorative — usually with buttons or a partial zipper at one end — and protects the doona from general wear. A quilt encasement fully encloses the doona inside a tightly-woven barrier fabric, with a zipper that closes to seal it inside. The encasement is what's used when the goal is reducing dust mite particles passing in and out.

Is this hypoallergenic?

The word "hypoallergenic" doesn't have a defined Australian standard, so we're cautious about applying it as a product claim. What we can tell you is what the fabric measurably does: it's tightly-woven 100% cotton with a pore size of 2.8 microns at maximum distribution, OEKO-TEX Standard 100 certified, with enclosed binding seams and a zippered closure.

What pore size is needed to limit dust mite allergens?

Dust mite allergen particles typically measure 10–40 microns. Anything below about 10 microns will limit them. This product's fabric tests at 2.8 microns at maximum distribution — well below that threshold.

Why 100% cotton rather than polyester or microfibre?

Cotton is breathable, washable at higher temperatures, and feels like normal bedding. Polyester or polyurethane-backed encasements can feel hot or noisy. The trade-off is that cotton encasements typically cost more.

Someone in my household has eczema or asthma — what can you tell me about the fabric?

We can describe what the fabric does — it's a tightly-woven 100% cotton barrier with enclosed binding seams — but we don't make claims about how that affects any medical condition. If you have eczema, asthma, or another diagnosed condition, please speak with your GP or allergist about whether barrier bedding suits your situation.

How often should I wash it?

Every 6 months is generally sufficient when a normal quilt cover or sheet sits on top to absorb daily wear. The decorative top layer gets washed weekly with your bed linen; the encasement underneath stays cleaner for longer.

What temperature should I wash it at?

60°C is the temperature most commonly cited for dust mite reduction in bedding, where the care label allows. Cooler washing still removes a high proportion of allergens.

Can I tumble dry it?

Yes, on medium heat. Avoid high heat — repeated hot drying can shrink cotton over time.

What is OEKO-TEX Standard 100?

OEKO-TEX Standard 100 is a global independent certification that tests every component of a textile product (fabric, thread, zipper, prints) for over 100 substances of concern.

Does it crinkle or feel like plastic?

No. It's woven cotton on both sides — there's no plastic membrane, no laminate, and no rustling sound when you move under it.

Does this block bed bugs?

The fabric weave (2.8 microns) is too tight for bed bugs or their eggs to pass through, and the zippered closure with enclosed binding seams has no gaps once closed. We describe this product primarily for dust mite use because that's the most common application, but the same physical barrier applies. If you're managing a bed bug infestation, an encasement is one part of a broader plan, and we'd suggest speaking with a licensed pest control professional.