Built according to the same design principles as the professional level Z20, the Stratus combines light aerodynamic efficiency and advanced comfort technologies. The shape has been refined for total performance on the road, ventilated for long climbs but quick for flat. The integrated Float Fit system offers comfort and safety thanks to a streamlined cut and an oversized dial that is easy to adjust with one hand. The Overbrow Ventilation system draws cold air in from the front and pushes it through a matrix of air channels to reduce overheating. And thanks to the adjustable No-Twist Tri-Glides, the straps stay flat and well positioned, no matter how hard you hammer. This model also includes the Multidirectional Impact Protection System (MIPS) for added protection against certain types of impacts.