Just1 J-STR Helmet Union Grey / Matte Black 6030390201001

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

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