Womens Series The Women's Series is a diverse collection of helmet styles, fits and prices tailored to the demands of female riders. While the level of detail and range of colors is unique within the Womens Series helmets, they do not feature a unique "Women's fit." That's because there is no anatomic difference between women and men's heads except for the average skull diameter measurement. And since Giro helmet sizes cover 98% of the human population, we believe the Women's Series offers more options to women than any other brand. Integrated MIPS® Brain Protection System All Giro helmets are designed to reduce as much energy as possible while meeting and exceeding stringent safety standards. The goal of Giro's Integrated Mips®-equipped helmets is to reduce rotational forces while enhancing fit and comfort by combining the Mips slip plane with the helmet's adjustable fit system. Giro believes that helmets equipped with this technology can reduce the amount of rotational force that may be transferred to rider's brain in certain impacts. Hardshell With In-Mold Hardbody Lower Wrap The two-piece shell combines a tough outer hard shell with a polycarbonate lower shell permanently fused to the liner for durability withoute excess weight. Wind Tunnel Internal Channeling Combined with the massive vents, internal channeling forces air to flow over the scalp, providing remarkable cooling power. Roc Loc 5 Fit System The industry benchmark in comfort, stability, adjustability and weight savings. In addition to enhancing the fit and comfort of helmets, Roc Loc 5 allows you to easily custom tune the fit tension and the fore-aft tilt of the helmet in seconds using a single hand. And it's lighter than comparable systems too, making it the ultimate in skull-hugging luxury. P.O.V. Adjustable visor Quick dry padding Slimline webbing Giro Radix MIPS Helmet Womens