ALPINESTARS SM5 Helmet - Solid - Matte Black - Medium 8303121-110-MD Valve Head Kit Pro Circuit for your head

Pro Circuit for your head

Smooth underside won't snag when crossing logs

Slim collar construction with stretch main fabric and microfiber comfort inner lining

4 Into 1 Full Shorty System Natural head-pipe

By flashing your ECU you are able to tune your bike without interfering with critical correction factors resulting in smoother power gains than ever before possible

ALPINESTARS SM5 Helmet - Solid - Matte Black - Medium 8303121-110-MD Valve Head Kit Pro Circuit for your headLightweight outer shell is constructed from a technologically advanced impact resistant thermoplastic in two sizes The inner and outer surfaces are engineered to minimize the effects of oblique impacts Multiple density inner liner to ensure the correct density in the correct area for enhanced impact absorption Patented visor release system insures the visor is released with the correct pre determined amount of force, irrespective of the angle of