The Bobster Spectrax is perfect for riders that use prescription lenses. It converts smoothly from sunglass to goggle with the included detachable strap. The removable RX insert fits securely between the shatter-resistant, anti-fog, polycarbonate lens and the anti-impact frame. It is lined with comfortable open cell foam. The curved, single-lens geometry provides for excellent peripheral vision. The lenses are interchangeable, and the kit comes with gray, clear, and orange lenses, which provide 100 percent UVA and UVB protection. Changing out lenses and inserting the RX insert is extremely easy and only requires the turn of a lock. Comes with a limited lifetime warranty, a zipper carrying case with a clip and straps to hold onto handlebars, and a cleaning cloth. Meets EN 166 high speed impact standards. Measures 49mm tall, 155mm long, and 145mm wide.