The SMK Gullwing Sonic GL 231 is a versatile modular helmet designed for riders who value flexibility, dependable protection and bold graphic styling. Made from an advanced energy-absorbing thermoplastic shell, this helmet delivers strong impact resistance while maintaining a lightweight feel suitable for long-distance touring and everyday commuting. Its modular flip-up design allows seamless switching between full-face safety and open-face convenience, making it ideal for riders who tackle both city traffic and highway travel. The clear quick-release visor provides a wide, distortion-free field of vision and supports Pinlock inserts for fog-free clarity. An integrated internal sun visor offers instant relief from bright sunlight. With multiple air vents and efficient internal channels, airflow remains steady and comfortable even on extended rides. The removable and washable hypoallergenic liner ensures a breathable, hygienic fit. Fully ECE certified, the SMK Gullwing Sonic GL 231 blends safety, comfort and standout Sonic graphics for modern touring and commuting riders.
Key Features
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ECE certified
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Modular flip-up helmet design
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Lightweight energy-absorbing thermoplastic shell
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Clear quick-release visor compatible with Pinlock inserts
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Integrated internal sun visor
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Wide, distortion-free visibility
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Multi-ventilation system for effective airflow
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Removable and washable hypoallergenic liner
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Moisture-wicking, breathable interior
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Quick-release chinstrap
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Sonic GL 231 bold graphic design







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