Nucleon KR-Cell CIR Chest Protector - Small Nucleon KR-Cell CiR Chest Protector The Nucleon KR-CiR is a high performance, super lightweight track and race chest protector featuring the Nucleon Cell technology The double-layered chest shell plate is constructed from a high performance polymeric material blend for optimized flexibility and excellent weight saving properties The chest protector's structure design and structure changes from the center towards the outside and provides the perfect balance between force dispersion and energy absorption Unique CELL microstructure is designed for advanced energy absorption, adaptivity, maximum breathability and air flow Ergonomic protection plate contours to the natural curve of the back ensuring optimum fit while riding Soft comfortable airmesh on the body side of the protector offers maximum breathability and rider comfort