Jackson 3015023 Over the Glasses Safety GlassesPart # 3015023Jackson OTG Features:Stylish over the glass safety eyewearFits over most prescription glassesIntegral side shields for added protectionComfortable fit for extended wearJackson OTG Specifications:Frame: Black Lens: Smoke Mirror Anit-FogBase Curve: 4Note: Base curve is the measurement of an eyewear lens or curvature. The higher the base curve, the greater the sweep of the eyewear. A higher base curve provides more wrap-around protection, peripheral vision and can reduce the need for side shields.