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You go to the doctor, and they tell you that you have allergies and need to cover your bed. So you search "allergy bedding" online, and a flood of products comes up — mattress protectors, waterproof covers, dust mite covers, anti-allergen encasements. No clear explanation of what any of it means or what you actually need.
This is exactly when customers call us. The three questions we hear most:
- What are allergy bedding covers?
- How do they actually work?
- Do I need to cover everything — mattress, box spring, pillows, duvet?
Let's answer all three.
What Are Allergy Bedding Covers?
"Allergy bedding" is a specialty term that sets these products apart from the regular mattress protectors sold at big box stores. You'll also see them called dust mite covers, allergy-proof bedding, mite encasements, or anti-allergen covers — they all refer to the same thing.
Here's the simplest definition:
Allergy bedding covers are zippered encasements for your mattress, box spring, pillows, and duvet that are made from fabrics specifically designed to block dust mite allergens, pet dander, mold spores, pollen, and bed bugs from passing through.
Two things set a true allergy cover apart from a regular mattress protector: the fabric is built to block microscopic allergen particles (not just spills), and the cover fully encases all six sides of the item and zips closed. A fitted-sheet style that only wraps the top and sides leaves the bottom exposed — allergens migrate freely through the uncovered area. That's not an allergy cover, that's just a regular mattress pad.
When properly encased, what's already inside your mattress stays inside — the dust mites and bed bugs gradually die off, starved of their food supply. And nothing new can get in. From the very first night, you stop being exposed to the allergens that have been keeping you up.
How Allergy Covers Work: Two Types of Fabric
There are two fundamentally different ways to build an allergen barrier into a fabric.
Membrane Fabrics (Waterproof)
A membrane cover bonds a urethane layer to the back of the base fabric using heat. It's the membrane — not the fabric — that blocks allergens. Because the membrane is a complete, impenetrable layer, these covers also block liquids, making them fully waterproof.
Our AllergyCare™ Stretch Knit is a membrane fabric — 100% polyester knit bonded to a 1-mil urethane membrane. It's soft, stretchy, completely waterproof, and bed bug-proof thanks to its patent-pending tape closure over the zipper. It's our top recommendation for children's beds, and the go-to choice for anyone who needs waterproof protection.
Micro-Weave Fabrics (Breathable)
A micro-weave cover is woven so tightly that the space between the fibers — the pore size — is too small for allergen particles to pass through. The fabric itself is the barrier. No coating, no membrane. These covers are generally softer, cooler, and more breathable than membrane covers, making them the preferred choice for adults.
Our micro-weave options:
- AllergyCare™ 100% Cotton — soft, breathable, pure cotton with a pore size of 4.6 microns. The most popular all-around choice.
- AllergyCare™ Organic Cotton — certified organic cotton, non-dyed, non-treated, and chemical-free with a pore size of 5.3 microns. The right choice for anyone with chemical sensitivities.
What About Vinyl?
We also carry vinyl covers, primarily for box springs. Vinyl gives you 100% protection from dust mites, pollen, bed bugs, and is completely waterproof — it's extremely effective and very cost-efficient. It's widely used in the hospitality industry for exactly those reasons.
For home use on a sleeping surface, though, vinyl is not the most comfortable. It's hot, and sleeping on it can feel like sleeping on a vinyl couch. We'd recommend it for box springs, spare room mattresses, storing a mattress, or commercial applications — not as your primary sleeping surface.
Do You Need to Cover Everything — Mattress, Box Spring, Pillows, and Duvet?
This is the question we get most often, and the honest answer is: for complete protection, yes.
Think of it this way — each piece of bedding is a separate allergen reservoir. Your mattress might have millions of dust mites in it, but if your pillow is uncovered, you're still breathing in allergens all night from inches away. Covering the mattress and leaving the box spring exposed means that mites in the box spring continue uninterrupted. Every gap in your coverage is a gap in your protection.
Here's what we recommend covering and why:
Mattress — Essential
The biggest allergen reservoir in your home. This is always step one. Make sure you measure the depth of your mattress accurately before ordering — if you have a mattress topper, measure the combined depth or order a cover sized to fit both.
Box Spring — Essential
Often overlooked, but box springs harbor just as many dust mites as mattresses. The open framework is an ideal environment — dark, warm, and full of accumulated skin cells. Cover it.
Every Sleeping Pillow — Essential
Pillows are inches from your face for 7–8 hours every night. An uncovered pillow is one of the most direct routes for allergen exposure. Cover every pillow you actually sleep on.
Duvet or Comforter — Highly Recommended
If you use a duvet without a top sheet, or if your comforter is older and has never been encased, it is worth covering it. Duvet covers are available in all the same fabrics as mattress covers.
Decorative Pillows — Not Necessary
Decorative pillows that you remove from the bed each night don't need to be encased. Instead, pull their covers off once a month and tumble them in the dryer on the air-fluff (no heat) setting for 10–15 minutes. That's enough to knock out accumulated dust and mites without the hassle of encasements.
A Note on Traveling With Allergy Covers
One underrated benefit of allergy covers: they travel. Fitted-style pillow encasements pack flat and take up almost no space in a bag. We always travel with extra pillow covers — hotel pillows are an unknown source of allergens, and slipping your own cover over a hotel pillow takes 30 seconds and can make a real difference in how you feel the next morning. Life doesn't have to stop because you have allergies.
The Bottom Line
Allergy bedding covers are the single most recommended environmental control step for dust mite allergy sufferers — and for good reason. They work from night one, they don't require medication, and once they're on, they do their job quietly in the background while you sleep.
The right fabric depends on your sleep style, whether you need waterproof protection, and whether you have chemical sensitivities. If you're not sure where to start, our buying guide walks through every decision.
→ Read the complete dust mite cover buying guide
Or call us at (800) 771-2246 — we've been helping people make this decision since 1989 and are happy to walk you through it.
Shop all allergy bedding covers →
Medical Disclaimer: This content is for educational and informational purposes only and is not intended as medical advice. Always consult a qualified healthcare provider regarding allergies, asthma, or other medical conditions.
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