If you've ever seen the "Terminator" movie series, starring Arnold Schwarzenegger, you would have noticed that he was wearing a pair of sun glasses in virtually every scene. The parts where he was riding a motorcycle, chasing the villain - or being chased by one - are especially relevant to this topic. Granted, those shades looked cool on Schwarzenegger's Terminator, but his motorcycle stoggles glasses in those movies are hardly practical for real-life motorcycling use. There are several reasons for this - one of which is the biker sunglasses he was using simply seem too casual, in the sense that they don't seem able to withstand the rigors of traveling at high speeds on the road. But then, the Terminator's motorcycle sun glasses are part of movie magic. Real life tells a different story.

Biker sunglasses need to be very durable - both the lens and the frame need to be extremely hardy. This is because there is a very real risk of debris flying off the road and hitting the biker in the face. Even if debris, such as a pebble or wood chip, is very small, the speed at which it hits the biker can be very dangerous. If the lens of one's motorcycle sun glasses is not of good quality, it could break and cause serious injury to the biker. That's why it is not recommended to wear sunglasses with glass lenses, because although they are resistant to scratches, they can break - especially when hit with debris at 80 miles an hour. Instead, go for biker eyewear whose lenses are made of polycarbonate. This material is very strong and is somewhat lightweight, so it's well-suited for use in road travel on a motorcycle. High-quality lenses undergo rigorous testing to ensure that they are able to withstand the stress of strong winds or adverse temperatures.