Alpinestars Nucleon Flex Proi Full Back Insert

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• Hybrid technology blends Cell and Flex to create an ultra-protective solution that delivers premium breathable performance, and maximum flexibility
• Ergonomically contoured dual zone outer shell constructed from an advanced polymeric blend with a solid cell structure core framed by a more flexible 3D Cell structure as the first line of defense
• Nucleon Flex technology layer on the central back zone
• Developed in three waist-to-shoulder dimensions in order to cover all body sizes