Just1 Motocross Helmet

Ride safe and stay comfortable. The Just1 J40 Mission Helmet adapts perfectly to your head, thanks to its new lining and two shell sizes. Moreover, it combines advanced safety features with lightweight design, making it ideal for both beginners and experienced riders.

Firstly, the high-quality thermoplastic resin shell delivers strong impact protection. In addition, the removable, washable inner lining keeps the helmet fresh, while PROTX2™ antimicrobial technology prevents bacterial build-up. Meanwhile, the J.1.E.R. Emergency Cheek Pad Removal System allows fast, safe extraction in emergencies.

Next, airflow remains efficient through 5 front intake vents and 6 rear exhaust vents, while the fully ventilated EPS-lined chin bar keeps you cool during intense rides. At the same time, the integrated vented roost guard protects against dirt and debris. Furthermore, the Double-D retention system ensures a secure, reliable fit. Finally, ECE 22.06 certification guarantees safety compliance, and the helmet remains lightweight from 1400 g.

Shell Types

• 2 ABS shell sizes
• 2 EPS shell sizes

Key Features

• High-quality thermoplastic resin shell
• J.1.E.R. Emergency Cheek Pad Removal System
• Double-D retention system
• Removable, washable inner lining
• PROTX2™ antimicrobial liner
• New lining treatment for improved comfort
• Fully ventilated EPS-lined chin bar
• Integrated vented roost guard
• 5 intake & 6 exhaust vents
• ECE 22.06 certified
• Lightweight: 1400 g

Overall, the Just1 J40 Mission Helmet combines adaptive fit, advanced protection, and superior ventilation, giving riders confidence, comfort, and safety on every ride.

Sizing

To determine which helmet size fits you best, measure the widest circumference of your head using a flexible measuring tape or piece of string; approximately 2cm above your eyebrows and ears as illustrated below. If your head measurement falls between two sizes, it is generally recommended to select the smaller of the two.

For maximum safety and comfort, take note of the following points when fitting the helmet (and securely fastening the chin strap):

• Helmet may take some effort to slide over your head, but should not be overly difficult
• Should fit snuggly around the crown of your head without creating uncomfortable pressure points
• The top padding presses on the top of your head
• The cheek pads press against your cheeks, so that your teeth touch the inside of your cheeks when opening / closing your mouth
• There should be no space to slide two fingers between the helmet and your temple
• Hold the helmet on either side and without moving your head, try to move the helmet up and down, and side to side. It should not be easy to move and you should feel the skin of your head and face being pulled
• Your eyes should be located in the center of the helmet's viewpoint