The Nucleon Plasma Full Chest Protector Insert is Alpinestars’ motorcycle chest protector insert engineered for road riders. CE EN 1621-3:2018 Level 2 certified, it combines a semi-rigid thermoplastic central zone with ultra-adaptive, bio-based Nucleon PLASMA viscoelastic construction to optimize impact dispersion and airflow. Extended side wings and inner silicone ribbing improve rib coverage and stability in Alpinestars racing suits, while the low-profile design enhances all-day comfort.