Pick up the helmet on your shelf and press a thumb into the cheek pad. After a year of riding, that foam has taken the shape of your face — a fit you paid for once and then earned. A filtering helmet asks you to throw that away and start again, for €720 (MCN, September 2025). The short answer, before the detail: buy a motorcycle helmet with air filter built in only if you are due a new helmet anyway and that helmet genuinely fits your head — otherwise retrofit, because a helmet and a filter wear out on completely different clocks, and bonding them into one purchase means replacing both when either one expires.
Key takeaways
- Zyon's filtering helmet is priced at €720 (£627) on pre-order, rising to €799 (£696) at release, with production set for late 2025 and deliveries from mid-2026 (MCN).
- India's Shellios Puros has been on sale since 2022 at ₹4,500 with an H13-grade HEPA filter, and ships only within India (Visordown).
- Both built-in helmets publish a figure around 80% — that is a whole-system exposure-reduction claim, not a filter media grade, and it is not comparable to a media rating such as H11 ≥95% on PM2.5.
- Helmet-mounted sensors on Bangkok and Chiang Mai rideshare riders recorded a rider-average PM2.5 of 133.8 µg/m³ on 30 January 2024, against 88.1 µg/m³ from static sensors (MobileSense, ACM COMPASS 2025) — the WHO 24-hour guideline is 15 µg/m³.
Four Years, Two Answers: How the Filtering Helmet Split Into Two Products
The filtering helmet did not converge on one design. It forked, and the fork is the story.
The first branch rebuilds the helmet around the filter. Shellios Puros arrived in India in 2022 at ₹4,500 (roughly £48), with an H13-grade HEPA filter mounted at the rear of the shell and a fan circulating filtered air to the rider's face, running off an in-built battery. It is claimed to reduce exposure to toxic pollutants by up to 80 percent, comes in medium (58 cm) and large, and is sold only in India (Visordown).
Three years later, Spain's Zyon took the same branch upmarket. Pre-orders opened at €720 (£627), rising to €799 (£696) on release, for a modular helmet with a four-layer cartridge in the chin bar — outer mesh for water and large particles, an electrostatic sheet for fine particulates, an activated carbon layer for gases, and a protective final layer. MCN reports lab testing showing the system filters more than 80% of fine particles, on a rechargeable battery lasting up to 18 hours, with replacement filters sold on subscription. Production was set for late 2025, with deliveries from mid-2026 — which is now (MCN). New Atlas reported the project had passed 4,000 pre-orders of a US$935 kit (New Atlas).
The second branch adds the filter to the helmet you already own. It gets far less coverage, because there is no launch event for a thing that clamps onto hardware you bought two years ago.
Four years in, a rider standing at that fork has had no map. Every article reviews a product. Almost none answer the question the rider actually has.
The fork, side by side
Pick a branch. Every figure below is sourced in the body of this post.
Takeaway: buying a filtering helmet replaces a fit you already have, and bonds the shell, the electronics and the filter media into a single purchase; retrofitting leaves the helmet alone and keeps the three on separate replacement schedules.
| Factor | Buy the filtering helmet | Retrofit the one you own |
|---|---|---|
| Price | €720 pre-order, €799 at release (Zyon); ₹4,500 (Shellios Puros) | Adds a unit to a helmet already paid for |
| What you replace | The whole helmet, including a fit you already have | Nothing about the helmet |
| Filtration figure | More than 80% of fine particles — a whole-system claim | Media grade stated separately, e.g. H11 ≥95% on PM2.5; the system figure depends on the seal |
| Availability | Zyon deliveries from mid-2026; Shellios sold only in India | Any helmet already on your shelf |
| Replacement clock | Shell, battery module and filter media bonded into one purchase | Each replaced on its own schedule |
| Honest drawback | You must accept that shell, that shape, that retention system | Adds mass and hardware to a certified helmet |
Why a Helmet and a Filter Wear Out on Different Clocks
This is the argument the whole decision turns on, and it is an engineering argument rather than a shopping one.
Fit is the safety variable, and it is not transferable. A helmet protects you in a crash only if it fits your head. Buying a filtering helmet means accepting that shell, that internal shape, that retention system. If it does not fit your head shape properly, you have traded impact protection for air quality — and impact protection is the reason the helmet exists. A retrofit changes nothing about the helmet that already fits.
Three components, three clocks, bonded into one purchase. The EPS liner degrades on a multi-year schedule. A fan-and-battery module is consumer electronics on a shorter one. Filter media is a consumable measured in weeks — Zyon ships 12 filters with the helmet and sells replacements on subscription. Integrate all three into a single product and the whole unit is governed by whichever component expires first. Keep them separate and each is replaced on its own schedule.
Three clocks in one helmet
Illustrative diagram of replacement cycles — not measured data.
"More than 80%" is an exposure-reduction claim, not a media-efficiency spec. This is where the category gets sloppy, and it matters more than the price gap. Both built-in helmets publish a figure around 80%. That is a system number — it already includes their own leak paths, seal quality and airflow design. It is not a filter grade. A media rating such as H11 ≥95% on PM2.5 describes the filter material alone, tested on its own. The two numbers measure different things and cannot be ranked against each other. A retrofit's system figure depends on its own seal, exactly as a built-in helmet's does. If you want the difference between media grades spelled out, we wrote up H11, H13 and activated carbon side by side.
The honest counterpoint. A retrofit adds mass and hardware to a certified helmet, and any modification to a helmet can in principle affect its certification. That is a real cost of the retrofit branch, and any comparison that only lists the other side's weaknesses is an advert rather than an analysis.
Where the Fork Leads: Filtration in 2031
The built-in branch has a structural ceiling that the retrofit branch does not, and the market data shows why.
India's bike helmet market is valued at US$373.25 million in 2025 and forecast to reach US$612.32 million by 2031, an 8.60% CAGR (TechSci Research). Globally, the motorcycle helmet market is estimated at US$3.1 billion in 2025, projected to reach US$6.2 billion by 2035 at 7.1% CAGR, with Asia-Pacific holding more than 67.2% of it (Future Market Insights).
Run the arithmetic on the sourced Indian figures and the 2031 market is 1.64× the 2025 figure (612.32 ÷ 373.25). That is real growth. But it is growth in new helmet purchases.
Here is the synthesis, flagged as synthesis: built-in filtration can only ever reach a rider at the moment they buy a new helmet. Retrofit filtration addresses every helmet already on a shelf. Even after six years of compounding growth, the built-in branch reaches the minority replacing a helmet, not the majority still wearing one. Helmets are replaced on a multi-year cycle; air quality is a problem riders have this week.
And it is this week. Helmet-mounted sensors on 10 motorcycle rideshare drivers — five in Bangkok, five in Chiang Mai — recorded a rider-average PM2.5 of 133.8 µg/m³ on 30 January 2024, against 88.1 µg/m³ from static sensors over the same period. Six of the ten riders were classified high-risk on a Hazard Quotient assessment, and exposure exceeded WHO limits even outside the polluted season (MobileSense, ACM COMPASS 2025). The WHO 24-hour guideline for PM2.5 is 15 µg/m³ (WHO 2021 air quality guidelines). A rider waiting for their next helmet replacement is waiting years to solve a daily problem.
Which One You Should Buy
A comparison that recommends the same thing to everyone is not a comparison. Here is the honest split.
Buy the built-in filtering helmet if: you are due a new helmet anyway; it genuinely fits your head shape; you are in a market where it is actually sold — Shellios ships only within India, Zyon delivers from mid-2026; and you would rather have one purchase and one charging routine than two objects to manage.
Retrofit if: your current helmet fits and is still in date; you ride in filtration-critical conditions now rather than at your next helmet replacement; or you want the helmet, the hardware and the filter media to be replaceable independently of each other.
Easi Breezi is the retrofit branch. It is an external unit that attaches magnetically to the helmet you already own and already fits — no drilling, no glue, no permanent modification — feeding H11 ≥95% PM2.5 filtered air across your face. IP67, Patent Pending, $199.00, shipping the week of 17 August 2026. That design is the direct consequence of the replacement-cycle argument above rather than a preference: keep the safety-critical part untouched, and let the consumable behave like a consumable. If you want the wider picture first, start with our helmet air filtration guide.
Frequently Asked Questions
Do motorcycle helmets come with air filters?
Almost none do. A small number of purpose-built models exist — Shellios Puros in India and Zyon in Europe — but the overwhelming majority of helmets on sale have open vents and no filtration media at all. We covered the state of the market in detail in do motorcycle helmets have air filters.
What is the best helmet with an air filter?
There is no single best one, because the question hides a prior decision. If you need a new helmet and one of the built-in models fits you, that is the simplest route. If your current helmet fits, retrofitting is usually the better engineering answer — you keep the fit you already have and you replace the filter media without replacing the shell.
Is there a helmet with an air purifier in India?
Yes. Shellios Puros has been sold in India since 2022 at ₹4,500, with an H13-grade HEPA filter at the rear of the shell and a fan pushing filtered air to the rider's face. It is available in medium and large, and shipping is restricted to India (Visordown).
Does a helmet clip-on air purifier work?
It depends on the same variable that governs a built-in system: the seal. Filter media grade sets the ceiling — H11 media is rated ≥95% on PM2.5 — but the share of air that actually passes through the media rather than around it determines the real-world figure. That is why a published "80%" system claim and a "95%" media rating are not comparable numbers.
Is it hard to breathe in a motorcycle helmet with a filter?
It should not be, provided the system is active rather than passive. Passive filtration puts media in the path of the air you draw in and you feel the resistance. A powered system uses a fan to push filtered air across your face, so the media resistance is handled by the fan, not by your lungs. Zyon's built-in system runs its fan for up to 18 hours on a charge (MCN).
Ready to Breathe Cleaner on Every Ride?
The helmet on your shelf already fits you, and it is already certified. The cleanest version of this decision, for most riders, is to leave that alone and add filtration you can replace on its own schedule.
See how the Easi Breezi unit mounts to the helmet you already own — H11 ≥95% PM2.5 media, IP67, Patent Pending, $199.00.
Written by Ash — mechanical engineer and founder of Easi Breezi, building an active HEPA filtration system for motorcycle helmets (patent pending). Based between Hong Kong and Bali, riding daily in the traffic this blog writes about.