The Realm is Giant's all-mountain bike helmet. What does that mean? With all-mountain riding, you tend to have long rides with big climbs and fast, aggressive descents. The Realm is lightweight, so riding in it all day doesn't wear you down. It has 25 huge vents to keep you cool on those long uphills. And when it's time to rip the downhill, the extra coverage gives you confidence to charge the hard line. The Cinch4 fit system gives you quick adjustment and a solid fit, and you get extra pads of varying widths to customize your fit.