The measured head circumference decides the size, not the S/M/L label · review
A mountain bike helmet in three published size bands, with eighteen channelled vents, a polycarbonate shell fused to EPS and three declared markings.
Our conclusion The only helmet on this page to cite a standard by number — ASTM F1447 — alongside CPSC and CE, and the only one to publish three size bands in centimeters. Eighteen vents with internal channelling, a big visor and a polycarbonate shell fused to EPS, at $49.99. It has no MIPS, and its own bullet says "two size available" before listing three.
A mountain bike helmet in three sizes with published ranges — M 54–58 cm (21.3 to 22.8 in), L 58–61 cm (22.8 to 24 in), XL 61–63 cm (24 to 24.8 in) — with a polycarbonate outer shell fused to an EPS liner, 18 wind-tunnel vents with internal channelling, a big visor, washable padding and chin pad, and an adjustable dial. $49.99.
“Complies with U.S. CPSC, ASTM F1447 and E.U. CE Safety Standard for Bicycle Helmets.”
Three markings, and F1447 is the specific ASTM standard for bicycle helmets rather than the word “ASTM” on its own. The Favoto on this page names CPSC, ASTM and CE without the number; the Schwinn names CPSC with its extended-head-coverage provision; the Giro and OutdoorMaster name nothing.
These remain manufacturer declarations, and nothing on this page assesses crash behavior. What a named number allows is a buyer looking the standard up, which “stringent safety standards” does not.
The introduction to this page says the ranges behind S/M/L differ enough that the same letter can be two centimeters apart between makers — and this listing proves it from the inside:
| maker | L means |
|---|---|
| BATFOX | 58–61 cm (22.8 to 24 in) |
| Favoto, on this page | 58–60 cm (22.8 to 23.6 in) |
| Schwinn, one size | 58–62 cm (22.8 to 24.4 in) |
A 61 cm (24 in) head fits this helmet’s L and is outside the Favoto’s. And at 61 cm (24 in) you are also at the bottom of this helmet’s XL, which is where a dial has least work to do.
Measure, then read the band.
BATFOX 18, Schwinn 20 or 21, OutdoorMaster 25, Favoto 26.
But: “18 wind tunnel vents with internal channelling.” Channelling is the feature the Giro Agilis on this page charges $119.95 to describe — ducts inside the shell that move air across the scalp rather than over the outside.
So the lowest vent count on this page comes with the one ventilation feature that is not just a hole count. Eighteen channelled vents and twenty-six plain ones are not comparable numbers, and neither listing gives an airflow figure.
“THREE SIZE AVAILABLE: adjustable dial to customize fit; with an easily-adjustable fit system you can easy to get the right fit, with two size available M for 54-58 cm (21.3 to 22.8 in), L for 58-61 cm (22.8 to 24 in), XL for 61-63 cm (24 to 24.8 in).”
The heading says three, the sentence says two, and then three are listed. The sizes themselves are consistent and complete; it is the counting that slipped — the same kind of slip as the Schwinn helmet on this page, which gives 20 vents in one bullet and 21 in another.
“Big Visor for sun and other elements protection.”
A large visor is a mountain-bike feature: it shades the eyes on a climb and keeps spray off on a descent, and it costs aerodynamic cleanliness and a little weight. It is not stated to be removable — where the Schwinn, OutdoorMaster and Favoto visors on this page all are.
For a road bike that matters: a fixed visor cannot be taken off, and on the drops it sits in the sightline.
Like the Schwinn, Favoto and Exclusky helmets on this page. The two MIPS helmets here are the OutdoorMaster at $59.99 and the Giro at $119.95.
The shipping record says 380 g (13.4 oz). The only self-published weight on this page is the Favoto’s 260 g (9.2 oz); this listing publishes none, and says only “durability without excess weight”.
No weight of its own, no MIPS or equivalent, no EPS thickness, no airflow figure, and no statement of whether the visor is removable — which on a helmet sold for both trail and road riding is the fitment question that decides it.
Read on the day this page was built: $50 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Prices quoted in this text were read on 2026-10-06. The live price is at the top of the page.
| Sizes | M 54–58 cm (21.3 to 22.8 in), L 58–61 cm (22.8 to 24 in), XL 61–63 cm (24 to 24.8 in) |
|---|---|
| Standards declared | CPSC, ASTM F1447, CE |
| Shell | Polycarbonate fused to EPS liner |
| Vents | 18, wind-tunnel with internal channelling |
| Visor | Big — removability not stated |
| Padding | Washable and removable, with chin pad |
| Fit | Adjustable dial |
| Price | $49.99 |
| Weight | Not published; 380 g (13.4 oz) on the shipping record |
| MIPS or rotational layer | None |
| EPS thickness | Not published |
| Amazon reference | B0CY8JFY57 |
| EAN | 0760518182512 |
Measure just above the eyebrows and read the band: M 54–58, L 58–61, XL 61–63 cm (24 to 24.8 in). This is one of only two helmets on this page to publish ranges at all. Note the overlaps — a 58 cm (22.8 in) head sits at the top of M and the bottom of L, and the lower end of a band is where a dial has the most adjustment left. A 61 cm (24 in) head fits this L and is outside the Favoto Large’s 58–60 cm (22.8 to 23.6 in).
The count is the lowest here — against 26 on the Favoto and 25 on the OutdoorMaster — but it comes with internal channelling, which is the feature the $119.95 Giro Agilis spends a whole bullet on. Vents alone move air over the outside of a shell; channels move it across the scalp. Eighteen channelled vents and twenty-six plain ones are not the same measurement, and no listing on this page gives an airflow figure to settle it.
BATFOX does not say, and on a helmet sold for "fire-road adventures to swooping single track" as well as general riding, that is the question. The Schwinn, OutdoorMaster and Favoto visors on this page are all stated to be removable; a big fixed visor sits in the sightline when you are down on the drops. Ask before buying if the helmet is meant for road use too.
A trail rider with a measured head between 54 and 63 cm (24.8 in) who wants the standard named
Amazon reports what buyers took in the month before this page was last checked: at least 800.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Specifications: the manufacturer sheet for bike gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
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