ALPINESTARS Nucleon KR-3 Back Protector - Black/Red - XS 6504718-13-XS

Spinal injuries can end a riding career—the Nucleon KR-3 is engineered to prevent that outcome. This back protector combines a rigid convex shell with adaptive soft-foam technology, absorbing impact energy before it reaches your vertebrae. Whether you're pushing lap times or commuting in traffic, it delivers track-level protection without the bulk or heat buildup of older designs.

Built for riders who refuse to compromise between safety and comfort, the KR-3 features a lattice structure that moves with your body, horizontal flex grooves that adapt to your spine's natural curvature, and vented kidney support that keeps you stable without restricting movement. The adjustable rib protector and shoulder-blade extensions provide comprehensive coverage across vulnerable zones.

• Convex central hard shell
• Soft viscoelastic PU foam
• Polymeric blend construction
• Lattice flexibility design
• Horizontal flex grooves
• Enhanced impact absorption
• Adjustable rib protection
• Shoulder blade padding
• Customizable waist adjustment
• Slim vented kidney belt
• Detachable elastic straps
• XS sizing (waist-to-shoulder optimized)
• Compatible with KR-C, KR-TB
• Track and street capable