Dust mites
Dust mites are the allergen most often behind bedding questions. This hub gathers the pages that deal with them directly, so you can see what the sources say before looking at any product.
Start with what lives in bedding, which relies on NIEHS and Allergy UK and notes that two studies found more mite allergen in synthetic pillows and duvets than in feather ones. The pore-size explainer covers a 1999 lab study on fabrics, and pillow fill types reports that no source ranks the common fills. The certification guide explains the Asthma & Allergy Friendly mark.
For products, the pillow and mattress protector roundups record what each maker states, and none of the five protector pages we read gave a pore size. The down against down alternative comparison covers the fill question.
What the evidence says
The evidence on these pages is mixed in kind: NIEHS and EPA advice (regulatory and guidance), a 1999 laboratory study on fabric pore size, and older studies finding more mite allergen on synthetic than on feather pillows. NIEHS says mites cannot be completely eliminated, and trials of covers alone give mixed results.
Study types are labelled on each source. This is educational information, not medical advice; see the medical disclaimer.
What we don't fully know
- None of the five mattress protector pages we read states a pore size.
- No source we read ranks down, feather, polyester, foam, latex, wool or buckwheat fills for allergy.
- We read abstracts and web pages, not full papers, and have not tested any product.
Product guides
- Best hypoallergenic bedding
Eleven products pass our records check: four comforters or duvets from Boll & Branch, Brooklinen, Buffy and Coop Home Goods that the maker calls hypoallergenic, a Parachute duvet with the same wording, and mattress protectors from Avocado Green, Coop Home Goods, Parachute, Purple and Tempur-Pedic. "Hypoallergenic" has no legal definition we found, so each entry is a maker claim with the material and certification statements beside it. - Best hypoallergenic comforter
Five of the six comforters here carry a maker claim of "hypoallergenic" and all six are polyester-type fill (recycled or microfiber) in a cotton or lyocell cover. The word has no legal definition, so use the stated materials and certifications, not the word, to choose. - Best hypoallergenic mattress protector
Only one of the five makers, Purple, calls its protector hypoallergenic on the page we read, and that is the maker's own claim. The others are compared by stated material and certification: Avocado (organic cotton, GOTS), Coop Home Goods (OEKO-TEX stated), Parachute (100% cotton, not waterproof) and Tempur-Pedic (polyester, no certification found). - Best hypoallergenic pillows
Seven pillows pass our records check. Boll & Branch, Brooklinen and Coop Home Goods call theirs hypoallergenic, which is the maker's word, not a defined standard. Buffy, Parachute and two Utopia Bedding pillows never use the word on the pages we read, so they are listed only on the materials and OEKO-TEX statements their pages show.
Versus
- Down vs down alternative pillows for allergies
The sources we read do not name a winner. Older studies found more dust mite allergen on synthetic pillows than on feather pillows, while down bedding has been linked to hypersensitivity pneumonitis in one cohort. None of our pillow records is a down pillow.
Guides and explainers
- Asthma and allergy friendly certification: what the program is
The Asthma & Allergy Friendly mark is run by Allergy Standards Limited (ASL), with the Asthma and Allergy Foundation of America (AAFA) as US partner. Independent labs test products against a standard for each product type. The public pages give principles, not numeric limits. - Dust-mite encasements: how pore size works
A 1999 lab study reports mite allergens were blocked below detectable limits by fabrics with an average pore size under 10 micrometres. AAFA says to look for pores too small for mites and their waste to pass. None of the five protector pages we read gave a pore size. - Why dust mites, not feathers, are the usual bedding allergen
The NIEHS and Allergy UK name house dust mites, and proteins in their droppings, as the allergen living in bedding. Two published studies found more mite allergen in synthetic pillows and duvets than in feather ones, so the fill type is not the deciding factor those sources point to. - What makes a mattress hypoallergenic: materials, certifications and the evidence
There is no legal definition, so "hypoallergenic mattress" is a maker word. The health bodies we read point at dust mites in the bed and at allergen-impermeable covers, hot washing and humidity, not at a mattress type. We found no source ranking latex, wool, foam or springs for allergy. - Pillow fill types compared
No source we read ranks down, feather, polyester, foam, latex, wool or buckwheat for allergy. The one direct fill comparison found more mite allergen on synthetic than feather pillows after a year, so the cover and washing routine matter as much as the fill.