It"s not that road helmets are substantially less durable than helmets made for mountain biking, it"s just that the three-way balance between ventilation, weight, and durability is readjusted for off-road purposes. The Giro Xar Helmet gets the same expert engineering found in the top-line road helmets. That means the same In-Mold process that make Giro road helmets some of the strongest and lightest on the market is also used for the Xar. The In-Mold construction process fuses the outer shell to the EPS foam liner. This process enhances the effectiveness of both parts. In fact, the fusion process actually reinforces those formerly vulnerable spots around the vents and ribs. It makes them lighter, more durable, and better ventilated than helmets with shells that are glued to the liner. Where the Xar differs slightly from the road helmets is in the focus placed on the ventilation. With 17 Wind Tunnel vents and internal channeling, Giro has hardly skimped on ventilation, it"s just that by reducing the number and size of the vents, slightly more emphasis has been put on durability. You"ll also have the benefit of the P. O. V. visor to deflect the sun, rain, and twigs. The visor has a patented internal clutch system that allows for 15 degrees of vertical adjustment without the need for any tools; just give it a quick whack with your hand. And if you"d rather not have it on at all, you can easily remove it without tools. Giro"s development of the Roc Loc 5 Fit System makes it possible micro-adjust your helmet on the fly, with just one hand. Though other helmet manufacturers have similar adjustability options, none of them even come close to the weight savings that the Roc Loc system offers: it is almost 40% lighter than comparable systems. The Giro Xar Helmet comes in Small, Medium and Large. It is available in Matte Black/Grey Bars, Matte White/Grey Bars and Black/Cyan/Lime.