Smith Optics Elite Aegis Arc Eyeshield Field Kit with Ignitor Spare Lens Tapered Lens Technology corrects distortion Superior ballistic impact protection per US-MIL-PRF-31013 standard Uncompromising optics and coverage per ANSI Z87.1 EN 166 compliant-Good fit for hat size 71/4 or greater Megol temples and soft nose to hold eyeshield in place