Alpinestars Nucleon KR-CELLi Back Protector

The Alpinestars Nucleon KR-CELLi is the back protector that disappears under your jacket: ultra-light, CE EN 1621-2:2014 Level 1 certified, and built with a proprietary cellular microstructure that absorbs impact before you even notice it. Because the best protection is the one you wear at all times.

Triple-segmented back plate

The back shell is divided into three independent segments made from a high-performance polymer blend. This construction provides optimal flexibility in any riding position without sacrificing a single gram of unnecessary weight. Horizontal flex channels allow the protector to adapt naturally to both sporty and upright riding positions.

Cellular microstructure — intelligent impact absorption

Alpinestars' unique cell design is not just decorative: each cell works independently to dissipate impact energy from the center outwards, finding the perfect balance between force dispersion and absorption. The result is a protector that reacts where it is needed most and lets you breathe where it is felt the least.

Ergonomics and comfort on the road

• Ergonomic contour that follows the natural curve of the spine
• Three waist-to-shoulder sizes to cover all body types
• Soft Airmesh on the body side — maximum breathability and comfort against the skin
• Horizontal flex channels to adapt to any riding position
• Unisex design and continuous use — suitable for all seasons

Technical specifications