HJC i20 Solid Chest Rigs: Part 1 An Unofficial History. The all new HJC I20 is designed to give riders a different approach to the classic open face half helmet. This street fighter inspired helmet comes with a removable mask and a wide vision, anti fog coated sun visor (Smoke) that manually operates with pull tabs located on each side of the helmet. The Advanced Polycarbonate Composite Shell is lightweight and offers a superior fit, using a 3 shell breakdown from sizes XS up to 2XL. This helmet is also ready to accept the SMART HJC Bluetooth systems (10B and 20B).