Check the listing for details. Alpinestars Nucleon Flex Pro Protection Vest MX ALL SIZES. Condition: New with tags. Listed at 199.95 USD. Alpinestars Nucleon Flex Pro Protection Vest Back Protector - Ergonomically contoured dual zone outershell Advanced polymeric blend with a solid cell structure core Solid cell core framed by a more flexible 32 cell structure Nucleon Flex technology layer on the central back zone Divided Chest Protector - Unique new longer length for more protection coverage in critical area Lightweight, ventilated and ultra-comfortable technology Rigorously tested and certified for proven performance in extreme temperatures Chest and back protector held securely in position by the breathable, soft-touch perforated mesh chassis that also delivers maximum airflow for enhanced rider comfort California Customers: WARNING: This product may contain chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov