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The Giro Siren is a perfect blend of style and performance. Designed specifically for women, the Siren has a crisp maximum field of vision. Injection Molded Cylindrical lenses offer refined optics with minimal distortion. The full range of performance-engineered lens tints and mirror coatings that help enhance vision are protected by a durable hard coating that resists scratches.The polycarbonate lenses filter 100% of harmful UV rays to keep your eyes protected in every condition from Blue Bird sun to cloudy overcast days. The Siren is compatible with all Giro helmets which results in increase airflow and a perfect fit. Enjoy the little things in life with a clear, crisp view with the Giro Siren Goggle. [+]