Alpinestars bionic mtb jacket bnsalpinestars bionic jacket provides unrivaled impact protection to the upper body and has been specifically designed to combine with alpinestars state of the art bionic neck support bns unlike other jacket protectors on the market the bionic jackets bespoke design enables integration with the bns so that it performs to its maximum potential in all riding conditions featuresce certified gp elbow and shoulder protectors provide excellent impact protection and