I know a lot of people buy inexpensive sunglasses because we lose them, break them or have someone else remove them from the truck/boat without our knowing. A cheap pair of glasses can do serious damage to your eyes. They may protect them from UV rays but the optics will be sooo bad that you may find yourself needing regular glasses sooner than expected. A couple of guys mentioned Costa Del Mar which is what I use. If you spend a little extra to get the 580 lens, the weight will be much lighter than their other glass lens. They also have amazing clarity and are endorsed by lots of optometrist. Anyway, optics should play as big of a part in decision to buy as polarization, UV protection and overall weight. 8-)