KNOX Advance X65 back protectors, the lightest CE approved back protectors on the market. Made in Britain by Knox. Weighing an incredible 130g so adds virtually no weight to a jacket. Knox Advance X65 Back Protectors are made from a 3 layer construction with a unique lightweight polypropylene honeycomb core. The protector is engineered to form a very strong, flexible and comfortable protector. CE approved to EN1621-2 -2003 Level 1 back protector.