Back protection Nucleon KR-3 developed in three sizes from waist to shoulder to cover all body types. The lattice back shell plate is made from a high-performance polymer blend optimizing flexibility and weight, combined with soft viscoelastic PU (polyurethane) foam construction. Unique injected mesh shell with ergonomic design to absorb impact and allow for maximum breathability and airflow. Nucleon PU foam on the central spine area for additional impact absorption performance. Additional convex design of the central hard shell offers the highest level of protection for the spine area. Horizontal flex grooves for adjustment in all riding positions. Adjustable rib protection for the rider's back made from a blend of high-performance polymer materials for additional side protection. Larger shoulder protection padding to protect the shoulder blade. Adjustable waistband for a custom fit. Slim, vented back belt for improved positional stability and a custom fit. Adjustable, removable elastic straps with a clip-on system for added comfort. Compatible with Nucleon KR-C and Nucleon KR-TB.