Sperian Fuse Safety Glasses feature dual nine-base wraparound frames giving you 180° field of vision without distortion. A soft, adjustable saddle nosebridge fits a range of nosebridge shapes. Optical-grade lenses with a protective hardcoat minimize scratching. The metal frame has a nickel-free top coating to help prevent skin reactions for people sensitive to nickel products. To prevent temple tips from touching the lenses when folded, hinge stoppers were put on the on metal temples.