The Nucleon Flex Plus family of impact armor features a rider-friendly design that adapts to the contours of the rider’s body - ensuring maximum comfort and protection. Boasting a sleek, low profile shape, these protectors blend a lightweight, perforated open cell structure with Alpinestars Flex technology in an ergonomic design for maximum levels of movement on the bike. Nucleon Flex Plus Armor surpasses the impact requirements for CE Level 1 EN1621-1:2012 certification. Nucleon Flex Plus Shoulder Protectors