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2023 Alpinestars S-M8 Radium 2 Helmet (Black/White)

SKU: 482-9139X

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Alpinestars S-M8 Radium 2 Helmet (Black/White)

Alpinestars approach to the creation of the advanced technology in the Supertech M8 draws on its depth of experience from over half a decade of world class innovation across the spectrum of motorsports and especially, its deep rooted commitment to motocross. As with all other categories of technology that Alpinestars has mastered, bringing a new, highly complex, product to fruition requires specialist experience and know-how and a project plan led by the best brains in protection development. The S-M8 shell has been profiled with performance as a priority and with a design style that identifies the profile of the helmet and its sculpted surface as uniquely ‘Alpinestars’. Another key feature is the S-M8 shell sizing solution; each helmet fit size has its own appropriate shell size to deliver the most anatomical solution for the wide variety of fit needs worldwide.


  • 4 anatomical shell sizes
  • Multi-density EPS polymer liner
  • Patented A-Head fitting height and angel adjustment system
  • Unique, patented visor release system
  • Collarbone protection feature at the shell base
  • Multi-directional Impact Protection System (MIPS)
  • Emergency Release System (ERS)
  • Eject inflation system fitment inside the crown of the shell

482-9139XS, 482-9139S, 482-9139M, 482-9139L, 482-9139X, 482-91392X


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2023 Alpinestars S-M8 Radium 2 Helmet (Black/White)

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