Spektrak has polycarbonate lenses AND comes with three replaceable sets?

The Spektrax is ideal for riders requiring prescription lenses, this eyewear converts smoothly from sunglass to goggle with the included detachable strap. The removable RX insert fits securely between the shatter-resistant polycarbonate lens and the anti-impact frame which is lined with open cell foam. Excellent peripheral vision is produced from the curved, single-lens geometry. For continued activity through the day and night, the three lens options of anti-fog smoked, amber and clear are included. It also comes with a carry case and a microfiber cloth to keep your sunglasses in best condition possible.