Shield IIIAnti Fog Lenses Frameless Design Floats in Water The Shield III sunglasses offer a frameless construction making them lightweight and providing excellent peripheral vision. The lenses themselves are precision crafted of impact resistant polycarbonate and exceed the ANSI Z87+ standards for high mass and high velocity impact protection. This eyewear wraps around the face and has closed cell memory foam to minimize wind disruption and turbulence. Shield