The Oakley SI Ballistic HNBL Glasses are optimized for performance and meet high impact standards for Mil-Spec 32432A and ANSI Z87.1 These tac glasses feature a low-profile design and easy lens exchange for seamless transition between on-duty to off-duty wear. The thin stem technology enables compatibility with over-ear hearing protection and communication systems while the three-point fit holds the lenses in precise optical alignment for a comfortable fit. On top of that, all lenses of these safety glasses have an anti-fog coating and provide a secure fit even in wet conditions thanks to the Unobtainium® nose pad.