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.