Alpinestars Nucleon Back Protector Insert



Alpinestars Nucleon KR-2i Back Protector Insert


  • CE Certified Level 2 (EN1621-2:2014)
  • Lightweight, flexible PU injected impact foam
  • Contoured for anatomical and adaptive fit
  • Perforated for breath-ability and comfort
  • Channel ventilation system for optimized airflow

Note: Size MD is recommended for Men's jackets size 50 and smaller and XS-MD. Size LG is recommended for Men's jackets size 52 and larger and LG-4XL. See specific Women's jackets for sizing recommendations.

Sizing Info:

Waist to Shoulder (in) Height (in)  Protector Size
15 - 17 56.75 - 64.25 SM
17 - 19 64.25 - 71.75 MD
19 - 20 71.75 - 76.5 LG

5.0 / 5.0
2 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
I put this Alpinestars Nucleon Insert into my Tour Master Jacket and wore the jacket to work. The guy I work with is into Kick Boxing Training (6'3" 210 lbs), I had him hit me as hard as he could in the middle of my back. Wow! Nice! Other than being shoved a couple feet forward, it completely absorbed the impact!

PROS: breathable, Very light, Absorbs A Heavy Impact

June 25, 2015
Very light weight
The back protector is very light weight, especially for being level 2 protection. It fits perfectly in my Alpinestars Megaton jacket. I would recommend it.

PROS: light

May 24, 2015
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Product Style Item # Manufacturer Product # Availability
SM 973533 27020152 In Stock: Ships within 24 hours
MD 973534 27020153 In Stock: Ships within 24 hours
LG 973535 27020154 In Stock: Ships within 24 hours