Giro Aries Spherical Helmet features state-of-the-art performance, protection, and style. Weighing only 270 grams in size medium, it centers on comfort and cooling power. Spherical Technology redirects energy away from the brain in certain impacts, while Progressive Layering and dual densities of Nanobead EPS foam provide comprehensive energy management. 24 Wind Tunnel vents are further enhanced by the AURA II Reinforcement Arch and a DryCore brow pad manages sweat and serves as part of a complex internal channeling system to maximize comfort.