The measured head circumference decides the size, not the S/M/L label · review
A MIPS recreational cycling helmet in size M with two interchangeable liner thicknesses, twenty-five vents and a removable visor.
Our conclusion MIPS at $59.99, half what the Giro on this page costs, with the one fit idea nothing else here has: two interchangeable liners of different thickness, 5.8 and 7.9 mm (0.31 in), so the shell can be matched to the head rather than only tightened onto it. It names no safety standard, and its 399 g (14.1 oz) is a shipping weight rather than a published one.
A size M recreational helmet with the MIPS system, two liners of different thickness — 0.23 and 0.31 inch, so 5.8 and 7.9 mm (0.31 in) — an adjustment dial, a removable visor, and 25 individual vents. $59.99.
“2 different thicknesses liners (0.23 & 0.31 inch) and the adjustment dial maximize the head fit, flexibly adapted to different kinds of cycling glasses and avoid pulling hair.”
A dial tightens a cradle round the back of the head. It does not change the gap between the shell and the top of the skull — and that gap is what decides whether a helmet rocks, whether glasses arms foul the edge, and whether the pads bear evenly.
Two liners, 2.1 mm (0.08 in) apart, change it. That is the only adjustment of its kind in this group, and the introduction to this shelf points at the general problem: the ranges behind a letter differ between makers, so a size M is a guess until the helmet is on.
The glasses point is specific and real: a thinner liner drops the shell, and a dropped shell meets the top of a pair of cycling glasses.
The Giro Agilis on this page is the only other MIPS helmet here, at twice the money, and its MIPS is Integrated — built into the fit system rather than added as a separate layer.
This listing describes MIPS plainly and with appropriate hedging: “designed to provide added safety for helmets in many accidents. For certain impacts, the system can reduce harmful rotational forces.”
Many, and certain. That is more careful wording than most safety copy, and it is the honest shape of the claim: MIPS addresses angled impacts, not all impacts. Nothing on this page assesses how any helmet behaves in a crash.
“Equipped with 25 individual vents… when skating, cycling, BMX, MTB and more.”
Vent counts in this group: BATFOX 18, Schwinn 20 or 21, OutdoorMaster 25, Favoto 26, Giro not stated.
The multi-sport claim is worth a caution of its own: skating helmets and cycling helmets are certified to different standards — the BATFOX and Favoto helmets on this page name ASTM F1447, which is the bicycle standard — and this listing names no standard at all. A helmet sold for skating ought to say which skating standard it meets.
Five bullets, and not one names CPSC, ASTM or CE. Any helmet sold in the United States must comply with the CPSC bicycle helmet standard; this listing simply does not say so, and a declared marking is the only thing a comparison page can report.
The Schwinn on this page names CPSC and its extended-head-coverage provision; the Favoto and BATFOX name three markings each.
The shipping record says 399 g (14.1 oz). The only helmet on this page to publish its own weight is the Favoto, at 260 g (9.2 oz).
A MIPS recreational helmet in M is typically nearer 300 g (10.6 oz) than 400, and the difference is the carton and the second liner. Treat 399 g (14.1 oz) as the parcel.
“1 × helmet, 2 × liners, OutdoorMaster’s friendly customer service.” The second liner is the one thing on this list that is a part rather than a courtesy, and it is the reason to choose this helmet.
No head circumference for M — on a shelf whose buying advice is to measure and compare to the range — no weight of its own, no safety standard, no MIPS version, and no statement of which liner is fitted when it arrives.
Read on the day this page was built: $60 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.
| Size | M — no circumference range published |
|---|---|
| Rotational protection | MIPS |
| Liners | Two, 5.8 mm (0.23 in) and 7.9 mm (0.31 in) (0.23 and 0.31 inch) |
| Fit | Adjustment dial |
| Vents | 25 individual |
| Visor | Removable |
| In the box | Helmet and two liners |
| Price | $59.99 — half the MIPS Giro here |
| Weight | Not published; 399 g (14.1 oz) on the shipping record |
| Safety standard | None named |
| Amazon reference | B09QCH6SW3 |
| EAN | 0732133115992 |
Because a dial cannot change the gap between shell and skull. It tightens a cradle round the back of the head; it does not raise or lower the shell. Two liners 2.1 mm (0.08 in) apart do — which decides whether the helmet rocks, whether the pads bear evenly, and whether the shell edge meets the top of a pair of cycling glasses. OutdoorMaster names the glasses case explicitly, and no other helmet in this group offers the adjustment.
The claim, in OutdoorMaster’s own careful words, is that "for certain impacts, the system can reduce harmful rotational forces" — angled impacts, not all impacts. That hedging is more honest than most safety copy. What this page cannot do is assess how any helmet behaves in a crash; what it can report is that two of six helmets here have MIPS, this at $59.99 and the Giro at $119.95.
The listing does not say, which is the real omission. Every helmet sold in the United States must comply with the CPSC bicycle standard, and three helmets on this page name their markings — the Schwinn names CPSC with extended head coverage, the Favoto and BATFOX name CPSC, ASTM and CE. This names none, and that matters more because it is also sold for skating, which is certified separately.
A head between sizes, or a rider whose glasses foul the helmet edge
Amazon reports what buyers took in the month before this page was last checked: at least 50.
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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A touring helmet from an established German sports brand, with a height-adjustable retention cradle, insect mesh in the front vents and a high-mounted integrated light.
Best for: Longer rides where a cradle that adjusts in two axes makes the difference over several hours.
M 54–58, L 58–61, XL 61–63 cm (24 to 24.8 in) · CPSC, ASTM F1447, CE · 18 vents · big visor
A mountain bike helmet in three published size bands, with eighteen channelled vents, a polycarbonate shell fused to EPS and three declared markings.
Best for: A trail rider with a measured head between 54 and 63 cm (24.8 in) who wants the standard named
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A size L helmet for 58–61 cm (22.8 to 24 in) heads with six rear LEDs in three modes, a removable visor and a dial adjuster, supplied with the CR1620 cell already fitted.
Best for: Riders with a larger head who want lighting and a visor without moving up in price.
