Short answer: NOMITE is not an encasing or an anti-allergy cover, but rather a certification for duvets with particularly densely woven covers. The fabric is so fine that dust mites cannot penetrate the interior of the duvet. This makes NOMITE-certified down duvets suitable for allergy sufferers — contrary to the widespread prejudice that down is taboo for house dust allergies. In fact, down even provides less breeding ground for mites than many synthetic fillings, because it regulates moisture better and creates a dry sleeping environment.
Do you have a house dust allergy and therefore sleep under a synthetic duvet? Then you are like many allergy sufferers who believe that down is the problem. In reality, it's not the down, but the mites — and they often find better living conditions in a poorly ventilated synthetic duvet than in a high-quality down duvet.
This guide explains what is behind the NOMITE certification, why it is relevant for allergy sufferers, and what you should really look for when buying a duvet for house dust allergies. As a NOMITE-certified manufacturer, we can show you what testing procedures a duvet undergoes before it can bear this seal.
Last updated: April 2026
Contents
- What does NOMITE mean? Definition and background
- How NOMITE protects allergy sufferers: Duvet cover density explained
- Myth debunked: Why down is better for allergy sufferers than you think
- Comparison: NOMITE down duvet vs. synthetic encasing vs. Primaloft
- Manufacturer insight: How we test NOMITE requirements
- Duvet for house dust allergy: What to look for
- NOMITE-certified down duvets from BEFA Limburg
- Frequently Asked Questions
What does NOMITE mean? Definition and background
NOMITE is a registered quality seal of the European Down and Feather Association (EDFA). It identifies duvets and pillows whose covers (inlets) are so densely woven that dust mites cannot pass through the fabric. The seal has existed since 1991 and is exclusively awarded to products with down or feather filling.
Important: NOMITE is not an encasing. An encasing is an additional cover that you pull over an existing duvet. NOMITE means that the duvet itself—its cover—already has the necessary density. You do not need an extra cover.
NOMITE vs. other seals
NOMITE stands alongside other certifications relevant to duvets:
- NOMITE: Mite-proofness of the cover — relevant for allergy sufferers
- Oeko-Tex Standard 100: Harmful substance testing — relevant for skin compatibility
- Downpass: Animal welfare and traceability — relevant for ethical sourcing
A high-quality down duvet ideally carries all three seals. Each tests a different aspect of product quality.
How NOMITE protects allergy sufferers: Duvet cover density explained
House dust mites are 0.1 to 0.5 millimeters in size. They feed on skin flakes and prefer to settle where it is warm and humid — i.e., in mattresses, pillows, and duvets. What causes allergy sufferers to react is not the mites themselves, but their fecal particles. These are only a few micrometers in size and are stirred up when turning over in bed.
The NOMITE seal addresses two points:
- The fabric is so dense that mites cannot penetrate. The thread count and weave of the cover prevent mites from entering the interior of the duvet. They find neither food nor optimal conditions there.
- Down and feathers are thermally cleaned. Before processing, the down is washed and dried at over 100 °C. This process kills existing mites and their eggs.
Thread count: The decisive number
The density of a cover is determined, among other things, by the thread count — the number of threads per square centimeter. A NOMITE-suitable cover typically has a thread count of over 280 threads/cm² in a down batiste weave. For comparison: a normal cotton fabric has 60–80 threads/cm².
The denser the fabric, the less can penetrate — neither mites nor fine down fibers (so-called down escape). This is also why high-quality down duvets do not "shed feathers": the cover reliably keeps everything inside.
Myth debunked: Why down is better for allergy sufferers than you think
Many allergy sufferers reflexively choose synthetic duvets because they believe down attracts mites. This is a common misconception. In fact, studies show that down duvets with dense covers have fewer mite infestations than inexpensive synthetic duvets.
The reasons:
- Moisture regulation: Down absorbs up to 15% of its own weight in moisture and releases it again. Synthetic fibers trap moisture. Mites need a relative humidity of over 65% — down keeps the sleeping climate drier and thus deprives mites of their livelihood.
- Dense cover: NOMITE-certified down duvets have a significantly denser fabric than many synthetic duvets. For synthetic duvets, the cover density is often not a quality criterion — mites can penetrate more easily.
- Thermal cleaning: Down is washed at over 100 °C during processing. Synthetic fibers do not undergo a comparable cleaning process.
From our production: We regularly find that customers with house dust allergies who have used synthetic duvets for years try a NOMITE down duvet for the first time — and report that their symptoms do not get worse, but better. This is due to the drier sleeping climate. Of course, a duvet does not replace medical treatment, but the choice of material does influence the risk of mites.
What then speaks against down duvets?
Honestly: little, if the quality is right. The most common reservations and what's behind them:
- "Down is a mite magnet." — False. Mites primarily settle in the mattress, not in the duvet. A NOMITE down duvet does not provide mites with access to the interior.
- "Synthetics are more hygienic." — Partially true: Synthetic duvets are often washable at 60 °C. But many BEFA down duvets are also washable at 60 °C. The hygiene difference is small with modern down duvets.
- "Down cannot be washed hot enough." — Outdated. Our down duvets are washable at 60 °C on a gentle cycle. More on this in our guide Washing a down duvet.
Comparison: NOMITE Down Duvet vs. Synthetic Encasing vs. Primaloft
There are three ways to an allergy-friendly duvet. Each has advantages and disadvantages. This table helps with the decision:
| Criterion | NOMITE Down Duvet | Synthetic + Encasing | Primaloft Bio |
|---|---|---|---|
| Mite protection | Integrated (dense cover) | External (encasing cover) | No organic breeding ground |
| Moisture regulation | Excellent | Poor (encasing traps moisture) | Moderate |
| Sleeping climate | Dry, temperature-regulating | Humid, frequent sweating | Neutral |
| Weight (135×200) | 400–900 g | 800–1,500 g (+ encasing) | 400–600 g |
| Washable at | 40–60 °C | 60 °C (encasing separately) | 60 °C |
| Sleeping comfort | Very high (light, fluffy) | Reduced (encasing rustles) | Good (down-like) |
| Lifespan | 10–15 years | 3–5 years (renew encasing) | 5–8 years |
| Vegan | No | Yes | Yes |
| Price (from) | From approx. €110 | From approx. €30 + €40 encasing | From approx. €70 |
Table conclusion: For allergy sufferers who prioritize sleeping comfort, the NOMITE down duvet is the best solution. Those looking for a vegan alternative should opt for Primaloft Bio. The synthetic encasing model is the cheapest option, but it limits sleeping comfort due to moisture build-up and rustling noises.
Down Duvet – 90% Down, Summer Duvet
NOMITE-certified summer duvet with 250 g filling weight (135×200 cm). Down Class 1, Oeko-Tex Standard 100 and Downpass certified. Washable at 60 °C. Made in Germany.
From €109.95
View nowManufacturer Insight: How We Test NOMITE Requirements
As a NOMITE-certified manufacturer, our down duvets undergo a multi-stage testing process before they can bear the seal. Two aspects are particularly important:
1. Inlay Density: The Pore Size Test
The inlay fabric is tested for its pore size. The pores must be small enough that neither mites (from 0.1 mm) nor down fibers can penetrate. In practice, this means:
- Fabric density: At least 280 threads per cm² in down batiste quality
- Air permeability: Under 2 dm³/m²/s — the fabric allows hardly any air through, which prevents mites from entering
- No mechanical damage: Every seam, every stitch is checked for tightness
2. Thread Count and Weave
Thread count alone is not enough. The weave is crucial. For NOMITE-suitable inlays, we use a so-called down batiste — a particularly densely woven, fine-threaded cotton fabric with a plain weave. This fabric is:
- Mite-proof due to the tight plain weave
- Breathable despite its density — water vapor escapes, mites do not
- Soft on the skin — no "plastic bag feeling" like some encasings
From our production: We test every batch of inlet fabric with an air permeability measuring device according to DIN EN ISO 9237. In addition, we take random samples for down escape: if no down penetrates the fabric, no mite can get through either. Every seam is sewn with the same dense thread and checked — a leaky seam would nullify the entire mite protection.
Buying Guide: What to Look For in a Duvet for House Dust Allergy
Not every down duvet is suitable for allergy sufferers — and not every "allergy duvet" is truly the best choice. These points will help you make a buying decision:
Mandatory: These certifications should be on the duvet
- NOMITE — guarantees the mite-proofness of the duvet cover
- Oeko-Tex Standard 100 — ensures that no allergy-triggering harmful substances are in the fabric
- Downpass — confirms ethical down sourcing and traceability
Recommended: These features improve allergy protection
- High down content (90%+): More down means better moisture regulation, leading to a drier sleeping climate less favorable to mites. You can find more about the differences in down quality in our comparison Goose Down vs. Duck Down.
- Washable at 60 °C: Reliably kills mites and their eggs. Not all down duvets tolerate 60 °C — check the manufacturer's instructions.
- Cassette construction: Prevents the filling from shifting and clumping in one corner. Evenly distributed filling means even ventilation.
Avoid: Common mistakes when buying duvets for allergy sufferers
- Cheap synthetic duvets without a quality seal: Often have loose fabric, allowing mites to easily penetrate. The "suitable for allergy sufferers" label is not a protected term.
- Only looking at the price: A cheap synthetic duvet (€20–€40) plus an encasing (€40) lasts 3–5 years. A NOMITE-certified down duvet (from €110) lasts 10–15 years. Calculated over its lifespan, the down duvet is often more cost-effective.
- Encasing as a permanent solution: Encasings noticeably worsen the sleeping climate. If you buy a duvet that is mite-proof on its own, you don't need one.
Vegan alternative: Primaloft Bio
If you want to avoid down for ethical reasons, Primaloft Bio is the best alternative for allergy sufferers. The synthetic microfiber does not provide an organic breeding ground for mites, is washable at 60 °C, and consists of at least 60% recycled material. You can find more about material selection for duvets in our summer duvet guide.
NOMITE-certified duvets from BEFA Limburg
All our down duvets are NOMITE-certified. Here are three recommendations for allergy sufferers — from light summer duvets to vegan alternatives:
Summary
NOMITE is a certification that confirms that the ticking of a down duvet is so tightly woven that house dust mites cannot penetrate. It is not an encasing, but a property of the duvet itself. Contrary to popular prejudice, NOMITE-certified down duvets are often the better choice for allergy sufferers than cheap synthetic duvets, as they regulate moisture better, thus depriving mites of their livelihood.
When buying a duvet for house dust allergy, pay attention to three seals: NOMITE (mite-proof), Oeko-Tex Standard 100 (free of harmful substances), and Downpass (ethical origin). If you want to avoid down, Primaloft Bio is the best allergy-friendly alternative.
Frequently Asked Questions
What does NOMITE mean?
NOMITE is a quality label from the European Down and Feather Association (EDFA). It identifies down and feather duvets whose ticking is so tightly woven that house dust mites cannot penetrate. The seal has existed since 1991 and is awarded according to standardized testing procedures.
Are there mites in down duvets?
In NOMITE-certified down duvets, there are no mites inside because the ticking fabric is mite-proof. The down is also thermally cleaned at over 100 °C. Mites primarily settle in the mattress, not in the duvet — provided the duvet has a dense ticking.
What are the arguments against down duvets for allergy sufferers?
There are few arguments against high-quality, NOMITE-certified down duvets for allergy sufferers. Only cheap down duvets without a quality seal, whose ticking is not mite-proof, are problematic. The main arguments against down duvets are ethical (animal products) — not allergological.
What are the healthiest duvets for allergy sufferers?
The healthiest duvets for allergy sufferers are NOMITE-certified down duvets and Primaloft Bio duvets. Both offer mite protection and a good sleeping climate. Down duvets regulate moisture best and keep the bed dry, which deprives mites of their livelihood. Primaloft is the best vegan alternative.
Can I wash a NOMITE down duvet at 60 degrees?
Many NOMITE down duvets are washable at 60 °C — check the manufacturer's instructions. All BEFA down duvets tolerate 60 °C on a gentle cycle with liquid detergent. 60 °C reliably kills house dust mites and their eggs.
Is NOMITE the same as an encasing?
No. An encasing is an additional cover that you put over an existing duvet. NOMITE means that the duvet itself has a mite-proof ticking. You don't need an encasing if your duvet is NOMITE-certified.
Which down duvet is suitable for allergy sufferers?
Only down duvets with NOMITE certification are suitable for allergy sufferers. Additionally, look for Oeko-Tex Standard 100 (free of harmful substances), a high down content of at least 90%, and washability at 60 °C. All BEFA down duvets meet these criteria.
How often should I wash my allergy-friendly duvet?
Wash your duvet for house dust allergy every 3–6 months at 60 °C. Between washes, daily airing helps: shake out the duvet, air the bedroom for 10–15 minutes. This reduces moisture and thus the living conditions for mites.