No mattress is anti-allergy: house dust mites live in every type, and a bare "hypoallergenic" claim has no defining UK standard or body that checks it. If you're shopping because you wake with a blocked nose, the obvious purchase is a mattress with the reassuring label. I'd keep your money in your pocket for a moment. An allergen-proof encasing and regular washing are much more useful things to look at than another soothing adjective.
Reducing exposure takes several measures together: washable covers, hot-washed bedding, an aired bed and a drier room, alongside encasings. A recognised scheme such as Allergy UK's Seal of Approval is worth looking for; an unexplained "anti-allergy" badge is very little to go on. The shopping would be simpler if you could buy your way out with one embroidered label, wouldn't it? Get persistent symptoms checked by your GP before spending money on a guessed cause.
"Hypoallergenic" has no defining UK mattress standard
You can't judge a mattress's suitability from "hypoallergenic" alone, because no UK body defines or tests that bare claim. "Anti-allergy" is used in much the same way. I think these are wonderfully convenient words for a seller: reassuring enough to catch your attention, vague enough to leave you doing the investigating. Look for a named certification scheme and an explanation of what it checks before paying extra.
Those words usually refer to a treated or tightly woven cover, or to foam or latex used in place of fibre fillings. These are different construction choices. A close weave describes the fabric; a treatment means something has been applied to it. Neither description tells you that the complete mattress will keep you away from dust-mite allergen, and foam and latex mattresses host mites too.
A recognised scheme, such as Allergy UK's Seal of Approval , tests products against its own published criteria. That's a meaningful distinction from a manufacturer simply putting "hypoallergenic" in the name. Check the exact product against the scheme's listing and read what the certification covers. You deserve a little more detail than a leaf graphic and a lovely shade of green. The same goes for "organic" and "eco": ask which certificate supports the wording.
Dust mites live throughout the bedroom, and allergy is associated with poor sleep
Your mattress is only one place where dust-mite allergen accumulates, so replacing it leaves other sources untouched. House dust mites feed on shed skin and thrive in warm, humid conditions. The allergen is mainly in their droppings.
Pillows and duvets are reservoirs too, as are carpets and sofas. Yes, even the decorative cushions you remove every evening and put back every morning. That is why I would look at your bedding and room together: a new mattress underneath an unchanged pile of soft furnishings addresses only part of the exposure.
More severe rhinitis went with more sleep complaints in Leger and colleagues' 2017 survey ; about half of the adults reported poor-quality sleep, and snoring and night waking were common. The participants were adults and children in France who already had a diagnosed house-dust-mite allergy and were starting immunotherapy.1
“ The most commonly observed sleep complaints were poor-quality sleep (50.3% of adults and 37.3% of children), snoring (48.1 and 41.4%, respectively) and nocturnal awakening (37.6 and 28.2%, respectively).
My view is that the sleep disruption deserves proper attention before a shopping trip. A blocked nose every morning, itchy eyes or disturbed sleep are reasons to speak to your GP; they don't tell you by themselves what you're allergic to. Resist the temptation to diagnose yourself halfway through adding something to your basket. Your GP or an allergy clinic can investigate the cause before you spend money tackling the wrong thing.
Reducing exposure takes several household measures together
The useful approach combines allergen-proof encasings with washing and changes around the bedroom. In their 2018 review, Wilson and Platts-Mills describe how long-term avoidance can help prevent sensitisation and reduce the development and severity of respiratory disease.2
An allergen-proof encasing is a tightly woven cover that encloses the whole mattress and closes with a zip. Encasings are also used for pillows and duvets. Check for full enclosure when you buy: a washable pad stretched over the top is a different thing. I know, inspecting a zip is considerably less glamorous than choosing a new bed, but you need to know exactly what you're covering.
Encase the mattress, pillows and duvet. Each can hold allergen, so covering only the mattress leaves other bedding exposed.Wash bedding on a hot wash every week. Choose bedding whose care instructions allow that routine; something you can barely wash is an awkward choice for this job.Air the bed daily. Pull the duvet back so warmth and moisture can escape instead of making the bed straight away.Keep the bedroom cooler and drier. Mites thrive in warmth and humidity, so reduce damp conditions and allow ventilation.Vacuum regularly and reduce soft furnishings. Carpets and upholstered furniture hold allergen too, which is why cleaning beyond the bed matters.
A treated mattress cover has had a treatment applied to its fabric, usually with an anti-mite claim attached. The word "treated" tells you very little about the treatment or its practical effect. I wouldn't pay extra for that word alone, and it mustn't replace an encasing and regular hot washing. Otherwise you've bought another bit of bedtime admin with a reassuring name.
A washable protector is one of the places where I think a protector is useful, particularly when it makes regular cleaning easier. Keep its job clear, though: unless it is a full allergen-proof encasing, you still need the encasing. Before ordering either, check that it fits the mattress depth and read its washing instructions. There is no pleasure in discovering that the thing you bought for easier washing requires an elaborate care routine.
Choose the mattress for comfort and a cover you can wash
Choose a comfortable mattress with a removable, washable cover, then use an allergen-proof encasing whichever construction you buy. Foam, latex and sprung mattresses all host mites in their covers and fillings. For the mattress itself, I start with how much you sink into it and whether you can turn comfortably. A scratchy badge saying "anti-allergy" won't make a too-hard bed any more pleasant.
My usual starting point is a medium-firm pocket-sprung hybrid, with adjustments for your weight and sleeping position. Pocket springs with foam or latex above them give you support with cushioning; if you sleep hot, be cautious about deep memory foam. I prefer a more responsive surface if you turn frequently, because hauling yourself out of a deep foam dip is a bloody tedious way to spend the night.
The weight bands below are rough shopping guides, not clinical thresholds. Use them to narrow your options, then compare the feel: firmness descriptions vary between makers.
Your weight or sleeping habit My comfort starting point Under about 9 stone Look for a softer feel, especially on your side, because you compress the cushioning less. About 9 to 18 stone Try medium-firm first, with more surface cushioning for side sleeping. Over about 18 stone Look for firmer support, stronger springs and enough depth to keep you from sinking too far. You sleep mainly on your side Allow enough cushioning for your shoulder and hip to sink a little. You sleep on your front Try a firmer feel and a thin pillow so your middle doesn't sink deeply and your neck isn't pushed up. You change position often Try responsive springs or latex if latex is suitable for you; avoid deep, slow-sinking foam if turning feels difficult.
A removable, washable cover is the construction feature worth paying for here. Check that you can actually remove it and that its washing instructions suit your routine. A zip alone doesn't establish that a cover is washable. This is one of those unexciting details I care about much more than the dramatic product name.
If you have a latex allergy, avoid latex mattresses. Otherwise, choose between foam, latex and springs by how they feel to you. Wool and cotton fillings are options for comfort and temperature; they have no special status as an allergy choice. If you prefer that feel, compare mattresses with natural fillings on that basis, with the same encasing and cleaning routine.
A new mattress starts with less accumulated allergen, and an encasing helps keep that accumulation lower. That doesn't make replacement the first thing to do with an otherwise comfortable mattress. Inspect your existing mattress for sagging and check whether its cover can be washed before buying another one. If symptoms persist, speak to your GP.
If allergy symptoms persist or affect your breathing, or if you have asthma that is getting worse, speak to your GP. Wheezing, breathlessness or a tight chest that comes on suddenly needs urgent medical help.
Avoid paying extra for an allergy claim alone
Skip purchases based on an unexplained allergy claim, however reassuring the packaging looks. The mattress trade has quite enough adjectives to keep an embroidery factory busy. I prefer a cover you can wash and a certificate you can check to another bedtime promise.
Don't pay extra for "hypoallergenic" without a named scheme behind it. The bare wording has no defining UK mattress standard.Don't buy a mattress to treat undiagnosed symptoms. Your GP can investigate what you're allergic to before you commit to a purchase.Don't use a treated cover instead of an allergen-proof encasing and hot washing. A treatment is only one feature of the fabric.Avoid latex if you have a latex allergy. Choose another construction for your comfort.Don't assume foam or latex is mite-free. Both host mites, just as sprung mattresses do. 
