Giant may be best known for popular mountain bike models such as the Anthem, Trance and Reign, but the Taiwanese manufacturer actually has a pretty huge array of components and accessories too. Alongside carbon fibre wheels, dropper posts and flat pedals, you’ll also find a pretty comprehensive range of off-road riding kit, SPD shoes and even helmets. The Rail SX MIPS on test here is Giant’s premium open-face lid designed for trail and enduro shredders. It sits above the cheaper Rail and the Roost helmets. Though it looks very similar to the existing Rail helmet, the Rail SX is structurally unique, with greater coverage, an updated retention system, and a sleeker integrated MIPS liner. The Rail SX is Giant’s top-end enduro helmet. This has been my first head-on experience with a Giant-branded helmet. Having recently ridden with Troy Lee Designs A2, Specialized Ambush, Bontrager Rally and Bell Sixer helmets, I was intrigued to see how Giant’s latest brain bucket would stack up. To get yourself acquainted, here’s the rundown; Giant Rail SX MIPS Helmet Features...