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Alpinestars Nucleon KR-2i

The Nucleon KR-2i soft back protector is quick and convenient to insert and fit unobtrusively within a rider's jacket or suit for the ultimate in comfort and safety protection.


  • Lightweight, flexible PU injected impact foam
  • Contoured for anatomical and adaptive fit
  • Perforated for breathability and comfort
  • Channel ventilation system for optimized airflow
  • Dimensions: Small 15.5 x 9.5 inches, Medium 16.5 x 10 inches, Large 17.5 x 10.5 inches


  • Nucleon KR-2i Back Protector Insert is CE certified Level 2 (EN1621-2:2014)


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