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, along with a durable carrying case and microfiber cleaning cloth.