The Alpinestars Nucleon KR-CELLi Back Protector Insert is designed to provide lightweight, flexible protection that integrates easily into compatible riding gear. CE certified and extremely low in weight, this insert features an articulated, triple-segmented back shell plate that adapts naturally to the rider’s movement, delivering a comfortable and secure fit while riding. 

Constructed from a high-performance polymer blend, the KR-CELLi uses a unique CELL microstructure engineered to efficiently absorb impact energy while promoting airflow and breathability. This advanced design helps maintain comfort during longer rides without adding unnecessary bulk. Certified to EN 1621-2:2014 Level 1 standards, the Nucleon KR-CELLi Back Protector Insert offers dependable protection in a streamlined, rider-friendly package.