HJC i31 Open Face Urban Helmet
Size Guide
| Size | Head (cm) | Head (in) | Hat size |
|---|---|---|---|
| 3XS* | 50 to 51 | 19¾ to 20ā | 6¼ to 6ā |
| 2XS | 52 to 53 | 20½ to 20ā | 6½ to 6ā |
| XS | 54 to 55 | 21¼ to 21ā | 6¾ to 6ā |
| S | 55 to 56 | 21ā to 22 | 6ā to 7 |
| M | 57 to 58 | 22ā to 22ā | 7ā to 7¼ |
| L | 58 to 59 | 22ā to 23¼ | 7¼ to 7ā |
| XL | 60 to 61 | 23ā to 24 | 7½ to 7ā |
| 2XL | 62 to 63 | 24ā to 24¾ | 7¾ to 7ā |
| 3XL | 64 to 65 | 25ā to 25½ | 8 to 8ā |
| 4XL | 66 to 67 | 26 to 26ā | 8¼ to 8ā |
| 5XL | 68 to 69 | 26¾ to 27ā | 8½ to 8ā |
*3XS is a youth size, available on the C10 only.
How to measure: Measure the circumference of your head about 2 cm above the eyebrows, passing just above the ears and around the back of the head. The chart is a guide only: always try the helmet on at home and check the fit.
Head shape matters too. Helmets are shaped for round, intermediate or long oval heads, so a helmet in your size can still press on the forehead or feel loose at the sides if the shape is wrong.
Read our guide to measuring your head size and shape
If you're between sizes or unsure, contact us before ordering.
Need help choosing or with sizing?
Chat with us or email support@swiftmoto.shop
Quick shade from harsh light on everyday rides
If your daily ride moves between shaded streets and harsh midday sun, you can lower the HJC i31's integrated dark smoke sun shield when the glare builds, without carrying a tinted visor. The i31 is an ECE 22.06 approved open face helmet with a clear HJ-43 visor and an APC shell, which blends polycarbonate with ABS to balance strength with low weight.
The clear visor has an anti scratch coating, provides 99% UV protection and is compatible with a Pinlock 70 insert if you want to add an anti fog lens. A redesigned locking system holds the closed visor sealed against the helmet, and HJC has extended the sun shield by 5 mm to cover more of your view from the sun. Extended cheek pads help reduce wind noise and hold the helmet steady around your face.
HJC's ACS ventilation moves air from front to back through one intake and two exhausts, helping carry heat and humidity out of the helmet. The moisture wicking, quick drying crown and cheek pads come out for washing, glasses grooves make room for your eyewear and a micrometric buckle keeps fastening simple at frequent stops. As an open face helmet it has no chin bar, so it suits riders who prioritise an open view and easy stops over the extra facial coverage of a full face or modular helmet.
Key features
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ECE 22.06 approval: certified open face helmet with an APC polycarbonate composite shell
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Integrated sun shield: dark smoke HJ-V12 shield lowers for harsh light and is extended by 5 mm for more sun coverage
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HJ-43 visor: clear visor with an anti scratch coating and 99% UV protection
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Pinlock compatibility: the HJ-43 visor accepts a Pinlock 70 anti fog insert
-
Visor locking system: redesigned to hold the closed visor sealed against the helmet
-
ACS ventilation: one intake and two exhausts move air from front to back to help carry heat and humidity out
-
Extended cheek pads: help reduce wind noise and hold the helmet steady around your face
-
Removable interior: moisture wicking, quick drying crown and cheek pads come out for washing
-
Glasses grooves: make room for the arms of your glasses
-
Micrometric buckle: adjustable strap that keeps fastening simple when you are on and off the bike
| Helmet Type | Open face |
|---|---|
| Helmet Fit Type | Intermediate Oval |
| Riding Style | Street |
| Helmet Certification | ECE 22.06 |
| Multi Density EPS Lining | No |
| Reflective | No |
| Helmet Shell Material | Polycarbonate composite |
| Breathability | Good |
| Helmet Ventilation | 1 Intake, 2 Exhausts |
| Closure | Micrometric Buckle |
| Included Visor Colour | Clear |
| Integrated Sun Visor | Yes |
| Pinlock Included | No |
| Pinlock Visor Type | Pinlock 70 |
| Comms Compatible | Yes |
| Eyewear Compatible | Yes |
| Weight (grams) | 1500 |
| Warranty | 3 Years |
If you want a chin bar, the HJC C71 offers full face coverage with an integrated sun visor and a Pinlock 70 compatible visor.
Yes. An integrated dark smoke HJ-V12 sun shield lowers when the light is harsh, and HJC has extended it by 5 mm for more sun coverage. HJC advises using tinted shields in daylight only, so we recommend raising it at night and in poor visibility.
Can I fit a Pinlock anti fog insert?
Yes. The HJ-43 visor is compatible with a Pinlock 70 insert, which sits inside the visor to help stop it misting up in rain and humid conditions.
Is the i31 a full face helmet?
No. It is an ECE 22.06 approved open face helmet with a clear visor and an integrated sun shield, but no chin bar. A full face or modular helmet adds a chin bar for more facial coverage.
What does ECE 22.06 approval mean?
It means the i31 has passed the current UN helmet regulation used across Europe. Compared with the older 22.05 version, testing adds more impact points on the shell, an angled impact test for rotational forces and a visor test that fires a steel ball at the visor at 216 km/h.
Can I wear glasses with the i31?
Yes. Grooves in the interior make room for the arms of your glasses.
How do I wash the interior?
The crown and cheek pads come out. HJC recommends washing them by hand, or on a delicate machine cycle, then letting them air dry without a spin dryer.
FREE delivery to West Malaysia all orders over RM150.
RM25 delivery on all orders to East Malaysia
All orders are shipped from our warehouse in Petaling Jaya.
We want you to choose the right gear for your ride.
If you have ordered the wrong size item, or just changed your mind, you have 60 days to return your order to SwiftMoto. Read our full refund and returns policy.
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