SMK Allterra S01 X-Sprint Motocross Enduro Helmet GL257 – white/blue/orange

The SMK Allterra S01 X-Sprint Motocross Enduro Helmet GL257 is an off-road motocross/enduro motorcycle helmet from the SMK brand, with X-Sprint graphics, in white/blue/orange color. It is designed for motocross, enduro, and off-road riding and is ECE 22.06 homologated.

Key Features

• ECE 22.06 homologation – compliance with the latest European safety standard.
• Thermoplastic shell – resistant, durable, and suitably lightweight.
• Double-D ring buckle for reliable and precise fastening.
• Removable and washable inner lining for greater comfort and hygiene.
• Off-road design with an extended peak and ventilation for motocross and enduro.
• Unisex design – suitable for men and women.

Technical Specifications

Size Chart

We recommend measuring your head circumference (at the widest part) to choose the most suitable size.

What does ECE 22.06 homologation mean?

ECE 22.06 is the current version of the international safety standard UN Regulation No. 22 for protective motorcycle helmets. Homologation confirms that the helmet type has been tested according to prescribed procedures and meets the required conditions regarding protection, construction, retention system, field of vision, and other safety features.

The ECE 22.06 standard uses more demanding and comprehensive tests than the previous ECE 22.05 version. Helmets are checked at different speeds and in multiple areas of the shell, which better evaluates their performance in various types of traffic and off-road accidents.

What is checked under the ECE 22.06 standard?

• Impact energy absorption – checks how much energy the helmet transfers to the head upon impact.
• Impacts at different speeds – the helmet is tested at several load levels, not just one speed.
• Multiple impact zones – various parts of the shell are tested, including additional randomly selected points.
• Oblique or rotational impacts – the stress that can cause rotational head movement is also assessed.
• Shell and inner protective layer strength – the ability of the construction to withstand prescribed loads is checked.
• Helmet stability on the head – the helmet should not easily come off or slip from the head during an accident.
• Buckle and chin strap strength – the retention system must remain closed and correctly positioned even under high loads.
• User's field of vision – the helmet's construction must not dangerously limit the view while riding.
• Accessory safety – accessories and attachment points must not reduce the helmet's protective properties.