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. The Nucleon KR-CiS is a high performance, super lightweight track and race chest protector featuring Nucleon Cell technology.CONSTRUCTION• The chest protector’s structure design and structural change from center towards the outside provides the perfect balance between force dispersion and energy absorption.• Unique CELL microstructure designed for advanced energy absorption, adaptivity, maximum breathability and air flow.• Soft comfortable airmesh on the body side of the protector offers maximum breathability and rider comfort.PROTECTION• Ergonomic protection plate contour to the natural curve of the back ensuring optimum fit while riding.KYE FEATURE• Four buttons ensure a secure engagement with the Alpinestars slim fit Jacket.• The double-layered chest shell plate is constructed from a high performance polymeric material blend for optimized flexibility and excellent weight saving properties