Alpinestars Nucleon Plasma Back Protector Insert. Eco-friendly and sustainable impact absorbing material: a blend of bio-based materials and high performance polyurethane. Highly ventilated for superior airflow and breathability, with soft touch inner liner on the skin side for optimum comfort. Developed in three (3) waist-to-shoulder dimensions to cover all body sizes. Extensive number of ventilation channels for effective heat dissipation. Category II EN1621-2:2014 Level 2.