Alpinestars Nucleon KR-3 Back Protector

Top-of-the-line trackday back protection from Alpinestars. The Nucleon KR-3 packs back and kidney armor along with rib protection into one package.

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Highly flexible and breathable, the Alpinestars Nucleon KR-3 Back Protector is engineered for maximum performance. Using hard shell backed with a soft viscoelastic PU foam compound, the KR3 achieves both max comfort and extraordinary impact absorption. 


  • 3 waist-to-shoulder dimensions in order to cover all body sizes
  • Lattice-structured back shell plate constructed from a high performance polymeric material blend for optimized flexibility and excellent weight-saving properties
  • Soft viscoelastic PU foam compound
  • Ergonomic design design to absorb high impacts and allow maximum breathability and air flow
  • Nucleon PU foam on the central spine for extraordinary impact absorption performance
  • Convex central hard shell provides highest protection for the spine
  • Horizontal flex grooves for adaptive fit in all riding positions
  • Adjustable rib protector constructed of high performance polymeric material blend for additional side protection
  • Shoulder blade protective padding extensions protect the acromion bone
  • Waist adjustment for customized fit
  • Slim vented kidney belt for added position stability and security
  • Adjustable, detachable elastic shoulder straps
  • Compatible with the Alpinestars Nucleon KR-C Chest Protectors (sold separately)
  • Compatible with the Alpinestars Nucleon KR-TB Protector (sold separately)
  • CE certified to EN 1621-2:2014 Level 2
More Information
ProductBack Protector
ColorsBlack, Red
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