The Alpinestars Nucleon KR-2i Back Protector Insert is a lightweight, low-profile solution designed to upgrade protection without compromising comfort. Shaped to fit seamlessly into compatible Alpinestars jackets and suits, it delivers dependable back coverage while maintaining an ergonomic, anatomical fit that moves naturally with the rider. 

Engineered with a perforated structure and integrated ventilation channels, the KR-2i promotes airflow to help manage heat and improve comfort during longer rides. Its flexible construction keeps bulk to a minimum while still meeting EN 1621-2:2014 Level 2 safety standards, making it a practical choice for riders looking to enhance protection with a simple, effective insert.