Description: (from giro.com) The Pneumo offers elite-lever performance, full internal reinforcement and a sleek silhouette that captures the essence of perfect, winding roads. But it's the amazing amount of "Nothing" in this helmet that makes it so special. Fit System: Roc Loc 4. Construction: In-Mold. Ventilation: 19 Vents, Wind Tunnel. Features: 19 Vents. Weight: 10 oz. / 290g. Sizes: Small (51-55cm), Medium (55-59cm), & Large (59-63cm).
Works great for me, and I love the fit and all the vents. I have a big mellon, and this one fit me well. I use with my road bike and my mountain bike, haven't really missed no having a visor.
I own this helmet and use it exclusively for mountain biking even though it's a road helmet. You seriously forget you're wearing it, it's so light and airy. The thing is also super stable on your head and won't shift around when you cruise through rock gardens and whatnot. A bit pricey but worth the dough!