“Flextech” headgear has an ergonomic fit that provides the ultimate comfort to users. Its ultra-light shield lens shows excellent impact resistance, cold tolerance, and heat resistance despite its slim profile. The design of the shield lens assures steady refractive power at both front and back. It can be worn with other protective equipment (safety goggles, mask, helmet). Unlike a product with a flat lens, it does not bend or return to a circular shape even if heated by a molded product.