Protection or Illusion: How to Tell a Mosquito Net That Works From One That Does Not

Mosquitoes kill hundreds of thousands of people a year, the great majority through malaria, with dengue and West Nile also capable of killing (World Health Organization, World Malaria Report 2024). We say that once, plainly, and then we stop, because the number is a reason to be honest about protection, not a licence to frighten anyone.

Here is the honest problem. The mosquito-protection aisle sells a great many things as adequate protection that are not. A net is meant to be the most reliable defence there is: a physical wall of fabric between you and the insect, with nothing to inhale and nothing left on your skin. But a net only earns that reputation if it is actually built to do the job. A net that looks protective over a gap a mosquito flies through is not cheap protection. It is the appearance of protection over an open door. Someone has to be blunt about that, and it may as well be us.

The good news is that telling a working net from a decorative one is not a matter of trust or brand loyalty. It comes down to four things you can check.

1. Mesh, measured against the mosquito that bites you

A net stops a mosquito the way a colander stops a pea: only if the holes are smaller than the thing you want to keep out. The number that matters is mesh density, the count of holes across the fabric. Too coarse, and the net is a fashion object.

This matters more than it used to, because the vector has changed. Across southern and central Europe, the Asian tiger mosquito (Aedes albopictus) is now established and spreading, and it is a small, aggressive, daytime biter (European Centre for Disease Prevention and Control, Aedes albopictus factsheet). A weave that might have inconvenienced a large night-flying mosquito can let a small daytime biter straight through.

Nets built to recognised netting standards specify a fine, high-density mesh precisely so that it excludes the mosquitoes that carry disease, and the fabric's real strength turns out to depend on measurable properties such as denier, knit pattern and polymer, not on how the net looks in a photo (Malaria Journal, net strength study). If a listing does not state a mesh specification at all, treat the silence as your answer.

2. Durability, because protection is measured in years, not the first week

Fabric that arrives intact and frays within a season was never protection. It was a countdown. The failure shows up as widening holes at the seams, snags that ladder into gaps, and a weave that goes slack and pulls apart at the corners where it is handled most.

A net worth buying holds its structure for years of ordinary use, not until the first wash or the first tug. Durability is not marketing garnish: the strength of a net is a function of concrete material choices that can be measured and specified in advance (Malaria Journal, net strength study). It is the difference between a barrier and a temporary curtain.

3. Certification, the paper trail that turns a claim into a fact

Anyone can print "protects against mosquitoes" on a bag. Certification is what makes a claim checkable by someone other than the seller.

In the European Union, a net that carries an insecticide is a treated biocidal product, and placing one on the market legally requires authorisation under the EU Biocidal Products Regulation (Regulation (EU) No 528/2012). That authorisation is a public record with a number you can look up. Mosticare's treated nets are built to recognised netting standards and hold EU BPR authorisation for their permethrin treatment (EU-0026815-0000, granted by Commission Implementing Regulation (EU) 2022/2330, verifiable on EUR-Lex). One WHO-recommended active ingredient, permethrin, bound into the fibre, one formula rather than two.

An uncertified marketplace listing offers none of this. No mesh specification, no durability standard, no authorisation number, and sometimes a claimed treatment the product does not actually carry. These listings turn up across generic marketplace channels (unbranded Amazon, AliExpress, Temu, Wish and similar), and the pattern is the same wherever they appear: the confidence is in the copy, not in the product.

4. Correct use, because the best net fails if it is used wrong

A perfect net with a gap is a doorway. Tuck it in, close it fully, and repair the first small tear before it becomes a large one. A treated net should not be washed: laundering strips the permethrin into wastewater and weakens the barrier, so the mesh is replaced when it ages rather than laundered. Use is not an afterthought. It is the fourth pillar, and the one entirely in your hands.

What a net is not: the honest limit

Now the limit we will not hide. A net protects a bed, a balcony or a garden enclosure. It does not drain a breeding site. Standing water in a saucer, a blocked gutter or an old bucket is where mosquitoes are made, and no net anywhere addresses that. Emptying standing water weekly is the single most useful thing most households can do, and it is free.

A few notes on the rest of the aisle, because honesty cuts both ways. Repellents containing DEET or picaridin genuinely work and rank among the most effective topical options tested, with DEET giving the longest protection in head-to-head trials (Fradin and Day, New England Journal of Medicine, 2002). The honest critique is not that they fail; it is that they are a supplement to a barrier, not a barrier themselves, and their protection ends the moment you forget to reapply. Citronella and scented candles, by contrast, offer little meaningful protection outdoors: they deliver ambience, not a shield. And burning mosquito coils indoors releases fine particulate into the air you breathe, with one study finding that a single coil can release as much PM2.5 mass as burning between 75 and 137 cigarettes, a real respiratory tradeoff rather than a free one (Liu et al., Environmental Health Perspectives, 2003). Ineffective, harmful and effective-but-not-a-barrier are three different things, and blurring them into one smear helps no one.

The single question

An intact net of the correct mesh, kept in good repair and used properly, is real protection, whether or not it is treated. A treatment reinforces the barrier at the point of contact; it does not rescue a net that was never a barrier to begin with. So the question to ask of any net is not "is it treated?" It is: what is the mesh, will it last, can I verify the claim, and am I using it right?

Answer those four honestly and you will never again mistake the illusion of protection for the real thing.

Sources: WHO World Malaria Report 2024 | ECDC Aedes albopictus factsheet | Fradin and Day, NEJM 2002 | Liu et al., Environmental Health Perspectives 2003 | EU Biocidal Products Regulation 528/2012 | Commission Implementing Regulation (EU) 2022/2330

This article is general information, not medical advice. For travel health, disease risk or symptoms, consult a qualified healthcare professional.