Alpinestars Nucleon KR-1i Back Protector Insert

The Nucleon KR-1i form fits to your body. Great airflow and lightweight, the Nucleon KR-1i replacement back protector insert is CE Level 2. 

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The Nucleon KR-1i Hybrid Back Protector Insert is CE certified Level 2 to the latest back protector standard revision (EN1621-2:2014). Fusing together a lightweight, perforated hard shell and energy absorbing foam, this hybrid protector insert offers excellent impact resistance while being flexible and anatomically contoured. With its innovative cooling airflow channel system the Nucleon KR-1i Hybrid Back Protector Insert offers optimized levels of protection and comfort for sport and street riding.


  • Women's Stella Jackets:
    • 36-38 or XS-SM: Small Nucleon
    • 40-50 or MD-3XL: Medium Nucleon
  • Men's Jacket:
    • 44-50 or XS-MD: Medium Nucleon
    • 52-64 or LG-4XL: Large Nucleon
More Information
ProductBack Protector
ColorsBlack, White
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