Alpinestars Neck Brace.  The Bionic Neck Support (BNS) is a structure which works with the helmet to attempt to reduce the severity of a catastrophic neck injury. No product can guarantee protection from all motorcycle injuries, due to the varied dynamics of accidents, thus the BNS may not prevent injuries in all cases. The BNS functions by providing an alternative load path when the neck is compressed. If the helmet is in contact with the neck support at the moment of impact the overall load passing through the neck can be reduced, which may prevent a fracture from occurring. There is also a reduced injury from muscular injuries associated with extremes of head movement. Customers should be aware that in a catastrophic impact the aim of the device is to sacrifice other bones in order to preserve the neck, however in less critical situations precautions have been taken to limit this.

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  Size Guide:

  EU Size	US Size	Chest Size CM	Slim Build	Normal Build	Barrel Build
  42		85		S	S
  46	36	90	S	S	M
  48	38	95	S	M	M
  50	40	100	M	M	L
  52	42	105	M	M/L	L
  54	44	110	M	L	L
  56	46	115	L	L	L
  60	50	120	L