Alpinestars Nucleon Flex Pro Protection Vest Transparent Smoke Red Black The extremely lightweight Level 2 CE 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 an 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.1. 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 protector’s 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.