Engineered for road riders, the Nucleon PLASMA Back Protector Insert is Alpinestars’ advanced back protector insert for motorcyclists. Extremely lightweight, the Nucleon PLASMA Back Protector Insert features Alpinestars’ Nucleon PLASMA technology: a viscoelastic, impact-absorbing material whose design delivers high levels of adaptability, breathability, and ventilation. Backed with a soft-touch textile coating, this ultra-adaptive back protector delivers the optimum balance of force dispersion, flexibility, and comfort. The insert’s ultra-adaptive geometry compresses and extends to fit, improving coverage, airflow, and all-day comfort when inserted into the back protector pocket of Alpinestars-compatible motorcycle jackets and suits.