An ergonomic insert optimized for performance riding, the lightweight Nucleon KR-Cell CiS Protector incorporates an advanced micro-structure cell design for efficient impact energy absorption and high levels of airflow. Features: High performance, super lightweight track and race protector featuring Nucleon Cell technology.Four buttons ensure a secure engagement with the Alpinestars Slimfit Jacket.The double-layered shell plate is constructed from a high performance polymeric material blend for optimized flexibility and excellent weight saving properties.The chest protector’s structural design changes from the center towards the outside and provides the perfect balance between force dispersion and energy absorption.Unique Cell microstructure designed for advanced energy absorption, adaptivity, maximum breathability and airflow.Ergonomic protection plate contours to the natural body line ensuring an optimum fit while riding.Soft comfortable air-mesh on the body side of the protector offers maximum breathability and rider comfortLevel 2 Protection