Just1 Motocross Helmet

Ride safely and stay comfortable. The Just1 J39 Poseidon Helmet is a polycarbonate cross helmet designed for beginners and amateur riders who want reliable protection without extra weight. Moreover, it combines advanced features with a lightweight design, giving you confidence from the first ride.

Firstly, the thermoplastic resin outer shell absorbs impacts while staying lightweight. In addition, two shell sizes and three EPS sizes provide a precise, snug fit for all riders. Meanwhile, the removable, washable interior keeps the helmet clean and comfortable. Furthermore, the J.1.E.R. Emergency Cheek Pad Removal System allows quick, safe helmet removal during emergencies.

Next, airflow remains optimal through 8 front intakes and 6 rear exhaust vents, keeping you cool even on long rides. At the same time, the included peak extension protects from sun and debris. Additionally, the Double-D steel retention system secures the helmet firmly on your head. Finally, ECE 22.06 and DOT certifications guarantee trusted safety. As a result, the helmet balances protection, comfort, and lightweight performance starting from 1350g (+/-50g).

Key Features

• High-quality thermoplastic resin outer shell
• 2 shell sizes & 3 EPS sizes for a precise fit
• J.1.E.R. Emergency Cheek Pad Removal System
• Double-D steel retention system
• Fully removable, washable interior
• Redesigned interior for enhanced comfort
• 8 front air intakes & 6 rear exhaust vents
• Peak extension included
• ECE 22.06 & DOT certified
• Lightweight: 1350–1430g (+/-50g)

Overall, the Just1 J39 Poseidon Helmet protects, ventilates, and fits perfectly, ensuring beginners and amateur riders can ride longer, stay cool, and feel confident on every trail or track.

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