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Alpinestars Nucleon KR-CELLi Back Protector



This item is available as a Blem/Refurb. These are items that cannot be sold as "New" merchandise and are limited to stock on hand. See the product details for a description of the product's condition.

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Alpinestars Nucleon KR-CELLi Back Protector

The Nucleon KR-CELLi Back Protector from Alpinestars utilizes a polymeric material blend and a triple segmented back shell plate. This design forges the ideal balance between force dispersion and energy absorption to better serve your back in the event of an impact. The KR-CELLi contours to the natural curve of the back thanks to it's ergonomic design while the horizontal flexion grooves allow it to adjust to suit multiple riding positions.


  • Triple segmented back shell plate constructed of a polymeric material blend
  • Unique cell micro-structure designed for advanced energy absorption, adaptivity, maximum breathability and air flow
  • Ergonomic protection plate contours to the natural curve of the back
  • Horizontal flexion groves for an adaptive fit in different riding position
  • Airmesh on the body side of the protector offers maximum breathability
  • CE Level 1 protection


  • 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
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Product Style Item # Store SKU Manufacturer Product # Availability
Product Style SM Item # 1314693 Store SKU 663293 Manufacturer Product # 6503919-S Availability In Stock: Ships next business day
Product Style MD Item # 1314694 Store SKU 663294 Manufacturer Product # 6503919-M/6503919-002-M Availability In Stock: Ships next business day
Product Style LG Item # 1314695 Store SKU 663295 Manufacturer Product # 6503919-L/6503919-002-L Availability In Stock: Ships next business day
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