For users who wear prescription glasses, our Rx Overglasses offer high protection while still providing excellent vision. The glasses fit over most prescription eyewear and feature horizontal and vertical adjustable temples, anti-fog lens and Tuff-Stuff anti-scratch lens coating. The limited lens curvature offers the best optics and distortion-free wide-angle viewing.Established in 1914, MSA Safety Incorporated is the global leader in the development, manufacture and supply of safety products that protect people and facility infrastructures. Many MSA products integrate a combination of electronics, mechanical systems and advanced materials to protect users against hazardous or life-threatening situations. The company's comprehensive line of products is used by workers around the world in a broad range of markets, including the oil, gas and petrochemical industry, the fire service, the construction industry, mining, and the military. The company's core products include self-contained breathing apparatus, fixed gas and flame detection systems, portable gas detection instruments, industrial head protection, fire and rescue helmets, and fall protection devices.