Alpinestars Nucleon Flex Pro Protection Vest The extremely lightweight CE Level 2 and Ukca Nucleon Flex Pro Protection Vest features a highly ventilated hybrid of Nucleon Cell and Nucleon Flex protectors for the optimum balance of force dispersion and flexibility, and a Nucleon Flex Pro divided chest protector, with a soft-touch perforated mesh chassis for enhanced rider comfort. The back protector provides full-length protection coverage, and has ergonomically contoured dual zone outer shell constructed from an advanced polymeric blend with a solid Cell structure core framed by a more flexible 3D Cell structure as the first line of defense this is reinforced even further with the Nucleon Flex technology layer on the central back zone. In terms of construction this hybrid technology blends the best properties of Cell and Flex technologies to create an ultra-protective solution that delivers peerless breathable performance and maximum flexibility. The removable Nucleon Flex Pro Ci divided chest protectors are constructed with and advanced polymeric blend for optimized flexibility and excellent weight saving properties, while the chest protectors structure provides the perfect balance between force dispersion and energy absorption. The chest and back protector are held securely in position by the breathable soft-touch mesh chassis that also delivers maximum airflow for optimum rider comfort. Features: High performance polymeric material Cell and Nucleon Flex structures for optimized flexibility and excellent weight saving properties Back protectors design changes from the center towards the outside providing the perfect balance between energy absorption and flexibility Unique Nucleon Flex Pro chest protectors microstructure is designed for advanced energy absorption, adaptivity, maximum breathability and air flow Soft comfortable padding on the body side of the protector offers breathability and rider comfort Adjustable elasticated waist band for an enhanced secure fit Rigorously tested and certified for proven performance in extreme temperatures CE Level 2 back protector CE Level 2 divided chest protector