Protective and comfortable nucleon flex plus armor is highly flexible and adaptive and has a thin profile for optimum rider comfort Stretch accordion on knee area to increase comfort on the bike. Replaceable foam hip pad inserts for comfort (alpinestars level 1 ce-certified nucleon hip protector available as accessory upgrade). Level 1 ce-certified knee protectors for class-leading protection. Reflective prints on inner side of lower leg make the rider more visible to other road users.