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The Alpinestars Nucleon Flex Proi Back Protector Insert is part of the latest Alpinestars collection. . The extremely lightweight CE Level 2 Nucleon Flex Proi Back Protector Insert features a highly ventilated hybrid of Nucleon Cell and Nucleon Flex protectors for the optimum balance of force dispersion and flexibility, with a soft-touch 3D mesh liner for enhanced rider comfort. The back protector insert is a full-length back protector, about 22% longer than regular back protector inserts. The Nucleon Flex Proi is compatible with all Alpinestars' sport and touring jackets that have released since Spring 2022, as all jackets have a double pocket to insert either a regular or longer back protector insert. The goal of the Nucleon Flex Proi is to deliver full-length coverage in terms of protection like a fixed back protector does, but with the practicality of an insert. . Key Features / Points: . Dual Zone Outer Shell . CE Level 2 Certified . Lightweight & Flexible . Soft 3D Mesh on the Body Side . Alpinestars Suits & Jackets Compatibility . View all Alpinestars Armour & Protection. View all Armour Inserts. .