These are the sunglasses that use optical technology developed by NASA to improve visual clarity while protecting eyes from UV rays. The polarized lenses are made with TriLenium 7 polarized technology that blocks 99.9% of harmful UVA and UVB rays as well as scattered blue light, enhancing vision and diminishing distortion. The mirrored lenses are covered with two layers of a scratch-resistant coating that also prevent smudges and repel water. The frame is made from a durable aluminum-magnesium alloy. Durable black aluminum-magnesium alloy frame.