The Giro Sheer Helmet. Plush finishing details, an amazing fit, and a feather light weight make the Giro Sheer helmet is a great choice for women who want performance and style. Our Stack Vent will help keep your goggles clear while maintaining seamless goggle and helmet integration. Features: Women's Specific Fit 2 In Form sizes Compatible with all after market TuneUps systems Compliance: ASTM F2040 / CE EN1077 In-mold Shell/EPS Liner X-Static Anti Microbial 12 SuperCool Vents Thermostat Control StackVent SUPER FIT ENGINEERED IN FORM FIT SYSTEM