Alpinestars SM5 Rayon Helmet (8304121-1242-XL)

The Alpinestars SM5 helmet is the result of more than five years of intensive study, development, and testing. The company has scrutinized every possible aspect to engineer a helmet that is safe, thoughtfully designed, and delivers optimal protection and comfort. This lightweight helmet features a thermo-injected shell incorporating a special polymer blend enhanced by varying degrees of thickness, engineered to provide the optimal combination of impact protection and light weight.

The five-density EPS (Expanded Polystyrene) liner ensures the correct density in the correct area for enhanced impact absorption. The lightweight outer shell is constructed from a technologically advanced, impact-resistant thermoplastic, available in two sizes. The multiple-density inner liner ensures the correct density in the correct area for enhanced impact absorption.

The side shell, coupled with soft EPS foam, prevents damage to the collarbone in the event of a crash. The inner and outer surfaces are engineered to minimize the effects of oblique impacts. The helmet maximizes ventilation and heat transfer exchange thanks to its multi-air inlets and exhaust ports, while the visor has been designed to direct air into the ports for enhanced airflow.

The patented visor release system ensures the visor is released with the correct predetermined amount of force, irrespective of the angle of impact. The helmet also features an Emergency Release System and complies with FMVSS 218 safety standards.

The SM5 helmet is a Universal Fit, with the model number 8304121-1242-XL, and it weighs approximately 4.95 pounds.

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