The Alpinestars Nucleon Plasma Divided Chest Protector Insert is designed to add lightweight, breathable protection to a wide range of Alpinestars jackets without compromising comfort or mobility. Engineered to fit seamlessly into both current and previous Alpinestars garments, this divided chest protector offers a flexible, low-profile solution that moves naturally with the rider while enhancing upper-body protection. 

Built using Alpinestars’ innovative Plasma M design, the insert features extensive perforations to maximize airflow and heat dissipation, helping manage temperature during warm rides or high-effort conditions. A soft tactile backing improves comfort while helping maintain the protector’s structure and resistance to wear over time. Made from a USDA-certified bio-based, eco-friendly impact-absorbing material, the Nucleon Plasma Divided Chest Protector Insert exceeds minimum CE impact requirements and delivers dependable protection in a lightweight, rider-focused design.