Safe for direct sun viewing as certified by the ISO (International Organization for Standardization) and CE (Conformite Europeenne). These glasses incorporate metal coated black polymer film lenses that are a 1000 times darker than the darkest ordinary sunglasses. They not only dim the sun's visible light by a factor of millions, but they also block potentially harmful ultraviolet and infrared radiation.

The American Astronomical Society lists the maker of these eclipse viewing glasses, Rainbow Symphony Inc., as one of a handful of "safe solar viewer" manufacturers. NASA does not recommend specific companies, but they do recommend only using ISO-approved glasses.