Alpinestars Nucleon Flex Proi Full Back Protector Insert

Full-length Level 2 back protector insert offering flexible coverage, strong airflow, and a slim fit inside Alpinestars jackets. The Alpinestars Nucleon Flex Pro Back Protector Insert delivers full-length Level 2 protection in a lightweight, insert-style design. Built using a hybrid of Nucleon Cell and Nucleon Flex technologies, it balances effective impact force dispersion with flexibility and reduced weight. Approximately 22% longer than standard inserts, it offers extended coverage similar to a fixed back protector while maintaining everyday practicality. Designed to fit Alpinestars sport and touring jackets released since Spring 2022, the Nucleon Flex Pro integrates easily into dual back protector pockets. An adaptive structure improves energy absorption where needed while preserving mobility, and a soft-touch 3D mesh liner enhances airflow and comfort. Certified to EN 1621-2:2014 Level 2 (T+ & T-), it provides dependable protection without added bulk. NUCLEON FLEX PRO BKPROT LRG.