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 not only safe but also thoughtfully designed to deliver 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, while the side shell coupled with soft EPS foam prevents damage to the collarbone in the event of a crash.

The inner and outer surfaces of the helmet are engineered to minimize the effects of oblique impacts. The helmet also features maximized ventilation and high levels of heat transfer exchange, thanks to multi-air inlets and exhaust ports. The visor has been designed to direct air into the ports for enhanced airflow, and the patented visor release system ensures the visor is released with the correct predetermined amount of force, irrespective of the angle of impact.

Additionally, the helmet is equipped with an Emergency Release System, and it complies with FMVSS 218 safety standards. The SM5 helmet is designed to provide a Universal Fit, and its model number is 8304121-1242-XL. The item package weight is 4.94937778189999 pounds.

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