The astrospec OTG® 3001 offers an economical alternative to custom prescription eyewear programs. Features 4-way adjustable temple lengths for a custom fit. Duoflex(®) temples are cushioned to relieve behind the ear pressure. Browguard and sideshields for complete eye protection. Polycarbonate lenses are easy to replace. Some styles available with 3.0 and 5.0 welding shade lenses. Meets ANSI Z87.1 and CSA Z94.3 standards. Also avalable are OTG Bumpers, once applied they prevent your vision glasses or PCvision glasses from connecting with the OTG glasses.