This product is great for different kinds of light. You can buy as many different lenses as you want and interchange them as you wish. The lenses come polarized and regular in many different colors. They also come in regular shape and in "XLJ" shape, for large heads. Additional lens price varies from $30-$60. For $25 you can buy a hard case to hold the glasses and extra lenses. I have had these for 3 years and have black iridium, fire, and ice polarized lenses and they have never broken. Excellent glasses from an excellent maker.
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