The extremely lightweight C.E. Level 2 certified Alpinestars 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. It also has 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.