Few helmets announce themselves quite like the Just1 J-STR Union in Neon Yellow and Gloss Black. Born from Just1's racing heritage and finished in a high-gloss two-tone livery that demands attention, this full-face helmet is built for riders who refuse to blend in — while meeting the rigorous demands of ECE 22.06 and DOT certification.

Key Features

• Dual-certified to ECE 22.06 and DOT standards for road-legal confidence in the UK, Europe and beyond
• ABS outer shell offered in two shell sizes for a more accurate fit across the size range
• EPS inner shell in two densities, tuned to absorb and dissipate impact energy efficiently
• J.I.E.R. Emergency Cheek Pads Removal System allows first responders to remove cheek pads swiftly and safely
• Wide Vision visor with scratch-resistant coating and Pinlock 70 preparation for fog-free riding in all seasons
• Interior lining treated with Protx2 antimicrobial technology — fully removable and machine washable

Design, Finish and Heritage

The Union colourway is one of Just1's most visually distinctive graphic treatments. The electric neon yellow panels cut sharply against the gloss black base, creating a graphic language that reads equally well at standstill or at speed. It is the kind of finish that looks deliberate rather than loud — a considered choice for riders who understand that visibility and style are not mutually exclusive.

Just1 built its reputation on the motocross circuit before translating that design intensity into road-going lids. The J-STR carries that legacy: aggressive lines, a compact silhouette and a paint quality that does justice to the artwork beneath it.

Safety Construction

The J-STR Union is engineered around a robust ABS outer shell produced in two shell sizes, so a size S does not simply wear a padded-out large shell — the geometry is genuinely scaled. Two EPS liner densities work together to manage energy across a broad range of impact speeds. The double-D retention ring is the choice of serious riders for its simplicity and security, and the J.I.E.R. emergency cheek pad removal system ensures that medical personnel can access the rider's head and neck without compromising care in an emergency.

Comfort and Ventilation

Inside, the J-STR Union features a fully removable and washable interior trimmed with Protx2 antimicrobial treatment — an effective barrier against odour and bacteria build-up on long tours or commutes in warmer weather. The cheek pads are ergonomically shaped and firm enough to provide lateral support without creating pressure points. An optimised ventilation system channels fresh air through the shell, keeping the interior temperature manageable even in summer riding conditions, so the helmet remains comfortable across extended journeys rather than just short blasts.

Visor System

The Wide Vision visor gives a noticeably broad field of view, reducing the need to turn your head as far when checking junctions or lane-changing on the motorway. The scratch-resistant coating protects optical clarity over time, and the visor is prepared for a Pinlock 70 insert — available separately — which eliminates misting in cold or wet conditions. A nose cover is included to reduce wind noise and direct air away from the visor.

Fitment and Compatibility

The Just1 J-STR is a universal full-face helmet suitable for road and sport riding across all motorcycle types. Select your size using the head circumference guide below. Measure just above the eyebrows at the widest point of the head; take two or three readings and use the largest. The helmet should feel snug and even — if it shifts with your skin rather than your skull when you push from side to side, size down.

How to Measure Your Head

• Place a flexible tape measure just above the eyebrows
• Measure at the widest point around the skull
• Take the measurement two or three times for accuracy
• The helmet must feel snug but not uncomfortable
• If the fit feels loose, drop one size

Specifications

• Brand: Just1
• Model: J-STR Union
• Colour: Neon Yellow / Gloss Black
• Type: Full-face helmet
• Shell material: ABS (2 shell sizes)
• Liner: EPS (2 sizes)
• Certification: ECE 22.06, DOT
• Visor: Wide Vision, scratch-resistant, Pinlock 70 ready
• Retention system: Double-D ring
• Emergency system: J.I.E.R. cheek pad removal
• Interior: Protx2 antimicrobial, fully removable and washable
• Part number: 6030390191001

• Just1 J-STR Union Neon Yellow / Gloss Black helmet
• Nose cover
• Helmet bag