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Alpinestars Nucleon KR-1 CELLi back protector. The extremely lightweight Nucleon KR-1 CELLi features a movable back shell plate for flexibility and driving fit, as well as an advanced cell design with micro-structure for efficient absorption of impact energy and high airflow. Features: Super lightweight back protector insert. Designed in three sizes from waist to shoulder to cover all body sizes. The design of the back protector changes from the middle to the outside, providing a perfect balance between energy absorption and flexibility. Horizontal flexion grooves for an adaptable fit in different riding positions. The soft, comfortable padding on the body side of the protector ensures breathability and rider comfort. Compatible with racing suits. Protection level 2