The ingeniously-designed Dainese Pro Armor G Back Protector uses an open framework of expanded nitrile rubber for maximum breathability and flexibility. Achieving a CE Level 2 rating for force dissipation, the Dainese Pro Armor G Back Protector Insert conforms smoothly to the shape of the rider's back and is sized to fit virtually every Dainese jacket available.; Back protector certified to CE Cat. II EN 1621.2/2014 Level 2 Expanded nitrile rubber Dynamic thickness Perforated structure for ultimate temperature comfort The G1 fits all Women's Jackets and Men's Jackets up to size 48 The G2 fits Men's Jackets size 50 and up