Just1 J-STR Full-Face Helmet Solid Gloss White 6030390181000
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Size chart JUST1 J-STR/PGR/PGRF
| Size | Head circumference (cm) | Head circumference (inch) |
|---|---|---|
| XS | 53–54 cm | 20.9–21.3 in |
| S | 55–56 cm | 21.7–22.0 in |
| M | 57–58 cm | 22.4–22.8 in |
| L | 59–60 cm | 23.2–23.6 in |
| XL | 61–62 cm | 24.0–24.4 in |
| XXL | 63–64 cm | 24.8–25.2 in |
How to measure your helmet size correctly: To find the right helmet size, measure your head circumference with a flexible tape measure.
It is important that the tape measure runs around the widest part of the head – only then will you get a correct result.
Place the tape measure at the front, about 1–2 cm above the eyebrows, and run it along the sides above the ears.
At the back, the tape must run over the largest part of the back of the head (not too low on the neck). The tape may run slightly at an angle – what matters is that it sits all the way around the largest points of the head.
Make sure the tape measure sits snugly but does not dig in. Measure 2–3 times for the most accurate result. You can then compare the measured value in centimetres (cm) with our size chart.
Tips for an accurate result
- Keep hair flat (e.g. do not measure over a voluminous hairstyle)
- Keep the tape horizontal, i.e. along the largest circumference
- Do not measure too loosely
- For values between two sizes:
→ usually choose the larger size (depending on helmet model / fit)
Important note on fit
The right helmet should fit firmly without causing uncomfortable pressure points.
A new helmet may feel a little tighter at first, as the inner lining adapts slightly over time.
- Worldwide shipping
- Genuine parts & verified quality
- Personal email support
- 14-day returns — in stock ships within 24h
Shipping & Returns
We ship with DHL and FedEx — express on request. If an item is in stock, express delivery can often go out within 1 business day. Standard delivery takes about 2–5 business days domestically and usually around a week worldwide. Please check the available shipping options and delivery times in your cart, as we offer several carriers depending on the country.
Returns must be registered in advance by email and are possible in line with our cancellation policy (14-day return request + 14-day return window after approval). Please note: unregistered returns are not accepted. You'll find all details on conditions, exceptions and refunds in our cancellation policy.
Payment & Security
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Built around an ABS shell engineered in two size-optimised geometries and lined with Protx2™ antibacterial fabric, the Just1 J-STR Solid Gloss White is a full-face helmet that takes construction quality seriously from the shell outward. The high-gloss white finish maximises on-road visibility while projecting a clean, timeless look that ages far better than graphic alternatives.
Key Features
- ABS outer shell produced in two shell sizes for a more precise fit at every head circumference
- EPS inner shell also manufactured in two sizes, matching impact absorption geometry to each shell
- Triple certification: ECE 22.06, DOT, and CCC — covering road use across Europe, North America and beyond
- J.I.E.R. Emergency Cheek Pads Removal System for rapid cheek-pad extraction by first responders
- Double-D retention system — the benchmark fastening method for secure, rattle-free closure
- Protx2™ interior lining: antibacterial, odour-inhibiting and fast-drying, fully removable and machine washable
- Scratch-resistant visor with a wide field of view, prepared for optional accessory visors
Shell Construction and Safety Architecture
The J-STR's ABS outer shell is not a single-size moulding stretched across the size range. Just1 produces it in two distinct geometries so that a size XS shell is proportionally correct for a 53–54 cm head rather than merely a scaled-down version of a larger mould. The EPS liner follows the same logic with its own two-size architecture, meaning the energy-absorbing foam sits at the right thickness and density regardless of which size you select. The result is consistent impact protection across the full XS-to-XXL range — a detail that matters and one that separates thoughtfully engineered helmets from budget alternatives.
Everyday Comfort and Hygiene
The Protx2™ interior treatment addresses one of the most persistent practical problems with regular helmet use: hygiene. The antibacterial and odour-inhibiting properties keep the lining fresher for longer between washes, while the fast-drying construction means the helmet is ready to ride again quickly after cleaning. All interior pads detach fully for machine washing, and the fit is designed to be snug and stable without creating pressure points on longer commutes or touring days. Ventilation channels promote air circulation to keep the interior temperature manageable across seasons.
Equipment and Practical Details
The J-STR comes with a nose cover included and ships in a helmet bag to protect the gloss finish during storage and transport. The scratch-resistant visor offers a wide field of view and is prepared for compatible accessory visors from the Just1 range, giving you the option to add a tinted or photochromic lens without replacing the helmet. The gloss white colourway is one of the most visible finishes available on road, an advantage that counts in low-light urban environments and on open roads alike.
Fitment and Compatibility
The Just1 J-STR is an adult full-face helmet available in sizes XS through XXL. Use the sizing table below and the fitting guide to select correctly — a helmet that rotates on the head is too large and must be exchanged for the next size down.
| Size | Head circumference (cm) | Head circumference (in) |
|---|---|---|
| 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 flexible tape measure approximately 1.5 cm above the eyebrows and around the widest point of the skull. Take the measurement two or three times to confirm accuracy. The helmet should feel firmly seated and even — snug but not painful. If the helmet can be rotated from side to side once fastened, select the next size down.
Specifications
- Brand: Just1
- Model: J-STR
- Part number: 6030390181000
- Type: Full-face helmet
- Outer shell material: ABS (2 shell sizes)
- Inner shell: EPS (2 sizes)
- Certifications: ECE 22.06, DOT, CCC
- Interior lining: Protx2™ antibacterial, removable and washable
- Retention system: Double-D ring
- Emergency system: J.I.E.R. Emergency Cheek Pads Removal System
- Visor: Scratch-resistant, wide field of view, accessory-visor ready
- Colour: Solid gloss white
- Sizes available: XS, S, M, L, XL, XXL
- Included: Helmet, nose cover, helmet bag
| Brand | Just1 |
|---|---|
| Model | J-STR |
| Part Number | 6030390181000 |
| Type | Full-face helmet |
| Outer Shell | ABS, 2 shell sizes |
| Inner Shell | EPS, 2 sizes |
| Certifications | ECE 22.06, DOT, CCC |
| Retention System | Double-D ring |
| Colour | Solid gloss white |
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Just1 J-STR Solid Gloss White helmet
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Nose cover
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Helmet bag
Fitment data coming soon.
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// Just1
Just1 J-STR Full-Face Helmet Solid Gloss White 6030390181000
Tech specs
- Brand
- Just1
- Model
- J-STR
- Part Number
- 6030390181000
- Type
- Full-face helmet
- Outer Shell
- ABS, 2 shell sizes
- Inner Shell
- EPS, 2 sizes
- Certifications
- ECE 22.06, DOT, CCC
- Retention System
- Double-D ring
- Colour
- Solid gloss white
- Worldwide shipping
- Genuine parts & verified quality
- 14-day returns — in stock ships within 24h
- Personal email support
// Support
Frequently asked questions
Shipping & delivery
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