Alpinestars Nucleon Flex Pro Full Back Protection Insert

Hybrid technology Alpinestars Nucleon Cell and Flex technologies providing ventilation and flexibility. Ergonomically contoured dual zone outer shell. Advanced polymeric blend with a solid cell structure core framed by a more flexible 3D cell structure. Nucleon Flex technology layer on the central back zone. More protection coverage in critical area. Lightweight, ventilated and ultra-comfortable technology. Rigorously tested and certified for proven performance in extreme temperatures.