Giro Atmos II Helmet In-Mold Polycarbonate Shell reinforces the area around the vents and ribs, creating a one-piece exoskeleton, which allows the helmet to be lighter, more durable and better ventilated than traditional designs Roll Cage is a light-yet-tough web of reinforcement, invisibility molded inside the helmet's EPS foam liner for maximum impact protection, strength and integrity Thermoformed SL Roll Cage is a polycarbonate skeleton fused throughout the helmet's impact absorbing EPS foam liner, which provides structural support, impact dispersion and penetration resistance 26 Wind Tunnel vents with internal channels thrust cool, fresh air over and around your head while forcing heat and stale air out