The facts.
| Brand | Just1 |
|---|---|
| Model | J-STR Union Grey / Matte Black |
| Part Number | 6030390201001 |
| Helmet Type | Full-face |
| Shell Material | ABS (2 shell sizes) |
| EPS Liner | Dual-density, 2 sizes |
| Certifications | ECE 22.06, DOT |
| Retention System | Double-D ring |
| Visor | Wide Vision, scratch-resistant, Pinlock 70 prepared |
DescriptionThe whole story▼
Built on the same safety platform that underpins Just1's track-focused J-STR series, the J-STR Union Grey / Matte Black delivers race-bred protection wrapped in a clean, understated matte finish. Whether you are pushing hard on a favourite back road or commuting with the same helmet you would wear at a track day, this lid refuses to compromise between performance and everyday usability.
Key Features
- ECE 22.06 and DOT certified — meeting the most current international safety standards for both road and track use
- ABS outer shell in two shell sizes, paired with a dual-density EPS liner in two sizes, for optimised impact management across the full size range
- J.I.E.R. Emergency Cheek Pads Removal System allows first responders to remove the helmet safely without risk of further injury
- Protx2 antimicrobial interior lining, fully removable and machine washable, keeps the helmet fresh across long riding seasons
- Wide Vision visor with scratch-resistant coating and Pinlock 70 preparation for genuine anti-fog capability in all conditions
- Effective multi-channel ventilation system promotes active airflow to keep the rider cool during spirited or extended riding
Race-Ready Construction for the Road
The J-STR shell architecture draws directly from Just1's motorsport experience. The two-shell-size ABS construction means every size in the range receives a properly proportioned helmet rather than one bloated shell stretched across every head circumference. The dual-density EPS liner reinforces this approach — energy is managed more precisely, which matters whether you are navigating a chicane at pace or surviving an unexpected low-side on the road.
The double-D ring retention system is the gold standard for helmet fastening: no ratchets, no slippage, just a mechanically simple closure that holds its position under impact. Paired with the J.I.E.R. emergency cheek pad extraction system, the J-STR Union meets the expectations of riders who take safety as seriously as they take performance.
Comfort Engineered for Distance
Long days in the saddle demand an interior that works as hard as the shell. The Protx2 antimicrobial lining actively inhibits bacterial growth, so the helmet stays genuinely fresh rather than merely smelling of fabric softener after a wash. The cheek pads provide a stable, snug fit without creating pressure points, and the full interior comes out in minutes for washing — a practical detail that matters when you ride regularly in all weathers.
The ventilation system channels air through the helmet efficiently, making the Union Grey a genuinely wearable choice in warm conditions rather than a helmet you tolerate while dreaming of removing it at the next stop.
Visor Clarity and All-Weather Readiness
The Wide Vision visor gives a generous field of view that reduces the need for excessive head movement in traffic or on track. The scratch-resistant coating protects optical clarity over time, and the Pinlock 70 preparation means you can add an anti-fog insert (sold separately) for autumn and winter riding without any modification. A nose cover is included to reduce interior buffeting and fogging at speed.
Fitment and Compatibility
The Just1 J-STR Union Grey / Matte Black is a full-face motorcycle helmet designed for adult riders. It is available in six sizes to suit a wide range of head circumferences. Use the size guide below to find your correct fit.
Size Guide
| Size | Head Circumference (cm) | Head Circumference (inches) |
|---|---|---|
| XS | 53–54 | 20.9 – 21.3 |
| S | 55–56 | 21.7 – 22.1 |
| M | 57–58 | 22.4 – 22.8 |
| L | 59–60 | 23.2 – 23.6 |
| XL | 61–62 | 24.0 – 24.4 |
| XXL | 63 | 24.8 – 25.2 |
How to Measure Your Head
- Place a soft tape measure just above your eyebrows and above your ears
- Measure at the widest point of your head
- Take two or three measurements and use the largest reading
- The helmet should fit snugly without pressure points — if it moves freely, size down
Specifications
- Brand: Just1
- Model: J-STR Union Grey / Matte Black
- Part number: 6030390201001
- Shell material: ABS (2 shell sizes)
- Liner: dual-density EPS (2 sizes)
- Certifications: ECE 22.06, DOT
- Retention system: double-D ring
- Visor: Wide Vision, scratch-resistant, Pinlock 70 prepared
- Interior: Protx2 antimicrobial, removable and washable
- Included: nose cover, helmet bag
What's includedEverything in the box▼
- Just1 J-STR Union Grey / Matte Black helmet
- Nose cover
- Helmet bag
FitmentBy head size — not by bike▼
Rated. Certified. Lit.
“Two shell sizes and two EPS sizes at 1,520 g, with a double-D ring, emergency cheek-pad release and a fully vented chin bar — a proper specification for the money. Be aware of what is behind the score: nobody has measured this helmet independently, so those areas are left out of the total rather than guessed.”
— the Inter-Pace crewECE 22.06.
ABS shell in two sizes, two EPS sizes, emergency cheek-pad release.
Not measured by anyone.
Protx2 antimicrobial lining, removable and washable.
Wide-vision visor, Pinlock prepared.
The chin bar is EPS-lined and fully vented.
1,520 g claimed.
One of the cheapest ECE 22.06 full-face helmets we sell.
143 € — Entry. Hover the bar for each range. Value is scored against the street field, not in the abstract.
J-STR vs —
Compare the grid.
| AGV K6 S83 | Nexx Y.10076 | Just1 J-STR72 | MT-Helmets Braker SV72 | Nexx Y.100R71 | LS2 FF901 Advant X70 | LS2 FF902 Scope II70 | LS2 FF901 Advant X Carbon69 | Shoei Neotec 369 | Suomy TX-Pro69 | KYT R2R68 | LS2 FF807 Dragon68 | LS2 FF811 Vector II68 | LS2 FF817 Challenger II68 | MT-Helmets Genesis R SV68 | Shoei GT-Air367 | Shoei GT-Air3 SMART67 | KYT TT-Revo66 | LS2 FF811 Vector II Carbon66 | Suomy Track-166 | MT-Helmets Atom 2 SV65 | MT-Helmets Targo S65 | LS2 FF818 Storm III64 | LS2 FF820 Rapid III64 | LS2 FF906 Advant64 | LS2 FF908 Strobe II64 | MT-Helmets KRE 263 | MT-Helmets Stinger 263 | MT-Helmets Streetfighter SV S63 | Nexx X.WST3 Matrix63 | AGV K1 S62 | Nexx X.TR Matrix62 | Nexx X.WST3 Carbon62 | LS2 FF808 Stream II61 | Nexx X.TR Carbon59 | MT-Helmets Thunder 4 R SV58 | Nexx X.LIFETOUR Matrix58 | Nolan N60-6 Sport58 | Nexx X.LIFETOUR Carbon57 | Shark Skwal53 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Inter-Pace Rating | 83/100 | 76/100 | 72/100 | 72/100 | 71/100 | 70/100 | 70/100 | 69/100 | 69/100 | 69/100 | 68/100 | 68/100 | 68/100 | 68/100 | 68/100 | 67/100 | 67/100 | 66/100 | 66/100 | 66/100 | 65/100 | 65/100 | 64/100 | 64/100 | 64/100 | 64/100 | 63/100 | 63/100 | 63/100 | 63/100 | 62/100 | 62/100 | 62/100 | 61/100 | 59/100 | 58/100 | 58/100 | 58/100 | 57/100 | 53/100 |
| Level | Recommended | Recommended | Recommended | Recommended | Recommended | Recommended | Recommended | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid | Solid |
| Price | 359,20 € | 143,99 € | €161,10 | 114,71 € | 175,99 € | 339,15 € | 152,15 € | 398,65 € | 669,00 € | 397,09 € | 181,55 € | 407,15 € | 220,15 € | 279,65 € | 114,71 € | 599,00 € | 649,00 € | 120,20 € | 322,15 € | 286,01 € | 152,96 € | 118,96 € | 169,15 € | 84,15 € | 254,15 € | 118,15 € | 269,96 € | 84,96 € | 114,71 € | 367,99 € | 223,20 € | 367,99 € | 495,99 € | 109,65 € | 503,99 € | 157,21 € | 399,99 € | 215,99 € | 519,99 € | 238,50 € |
| Weight | 1,298 kg | 1,575 kg | 1,52 kg | 1,55 kg | 1,575 kg | 1,6 kg | 1,75 kg | 1,55 kg | 1,715 kg | 1,35 kg | 1,5 kg | 1,45 kg | 1,5 kg | 1,5 kg | 1,65 kg | 1,7 kg | 1,775 kg | 1,55 kg | 1,391 kg | 1,35 kg | 1,7 kg | 1,55 kg | 1,55 kg | 1,35 kg | 1,75 kg | 1,7 kg | 1,38 kg | 1,6 kg | 1,4 kg | 1,675 kg | 1,448 kg | 1,657 kg | 1,55 kg | 1,6 kg | 1,7 kg | 1,5 kg | 1,86 kg | 1,47 kg | 1,75 kg | 1,57 kg |
| ECE 22.06 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| FIM racing | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Pinlock incl. | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — | ✓ | — | ✓ | — | — | ✓ | — | ✓ | ✓ | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Shell | Carbon and aramid fibre | Polyfusion shell | ABS | HIRP high impact resistant polymer | Polyfusion shell | HPFC composite fibre | KPA thermoplastic | Carbon fibre | AIM shell | Tricarboco (carbon, fibreglass, aramid) | Thermoplastic shell | 6K carbon fibre | Composite fibre | fibreglass | HIRP high impact resistant polymer | AIM shell | AIM shell | Thermoplastic shell | Carbon fibre | Tricarboco (carbon, aramid, fibreglass) | Polycarbonate | HIRP high impact resistant polymer | KPA thermoplastic | KPA thermoplastic | KPA thermoplastic | KPA thermoplastic | FRC (fibre reinforced composite) | HIRP high impact resistant polymer | HIRP high impact resistant polymer | X-Matrix composite | Thermoplastic resin | X-Matrix 2 multi-composite | X-Pro Carbon | polycarbonate | X-Pro Carbon | HIRP high impact resistant polymer | X-Matrix 2 multi-composite | Lexan polycarbonate | X-Pro Carbon | Thermoplastic shell with LED lighting |
| Ventilation | 9/10 | 8/10 | 6/10 | 8/10 | 8/10 | 8/10 | 10/10 | 8/10 | 8/10 | 8/10 | 6/10 | 8/10 | 10/10 | 10/10 | 5/10 | 8/10 | 8/10 | 6/10 | 10/10 | 8/10 | 6/10 | 8/10 | 8/10 | 6/10 | 8/10 | 8/10 | 3/10 | 8/10 | 8/10 | 8/10 | 6/10 | 4/10 | 8/10 | 8/10 | 4/10 | 4/10 | 6/10 | 5/10 | 6/10 | 5/10 |
| Comfort | 6/10 | 9/10 | 8/10 | 9/10 | 9/10 | 9/10 | 8/10 | 9/10 | 10/10 | 9/10 | 6/10 | 9/10 | 9/10 | 8/10 | 9/10 | 8/10 | 8/10 | 9/10 | 9/10 | 9/10 | 9/10 | 9/10 | 9/10 | 9/10 | 6/10 | 6/10 | 7/10 | 8/10 | 8/10 | 6/10 | 5/10 | 9/10 | 6/10 | 6/10 | 9/10 | 5/10 | 9/10 | 6/10 | 9/10 | 5/10 |
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Our team is happy to help. Use the contact button below and we’ll personally help you choose the right gear or part.
Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
Yes — it’s tested and approved to the current ECE 22.06 standard and road-legal across the EU.
Most of our touring and sport helmets are Pinlock-ready and many include the insert. Check the ‘What’s in the box’ section on this page for this model.
Yes — the cheek pads are channelled so the arms of your glasses slide in comfortably.
Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
Our team will personally help you choose the right gear or part — around 24h for a reply.