Designed for impact resistance and protection from IR up to shade 5. Meets requirements for EN166, ANSI/SEA Z87.1-2010 for welding , CSA Z94.3 for shade. Shade 3.0 and 5.0 alleviates eyestrain and reduces glare while also providing eye protection from Infrared (IR) and Ultraviolet (UV) radiation. WARNING: IRUV products block red spectrum colors and are not to be used when color recognition, such as when driving, is essential.