The supremely impact-resistant 6000 frame has a cutting edge design and modern flair while the Polycarbonate Sodium Flare wraparound lenses offer a close fit and the best impact protection. The rubber nose bridge and soft, rubber-tipped temples make this frame style one of our most versatile. Excellent for Soft Glass Working application This polycarbonate is very efficient in filtering sodium flare in addition to providing good ultraviolet protection. It is very comfortable for viewing under high ambient light conditions such as when working with glowing heat sources for a duration of time. Also, although it has a relatively low luminous transmission of 38%, it is not recommended for glassworking where Infrared protection is needed. This filter is more for soft glass usage.