100% UV protection does not mean they are polarized. Polarization blocks out certain light rays. Light rays coming directly from the sun oscillate in every direction while travelling in a straight line. When a light ray hits a surface and becomes reflected it usually oscillates in one certain plane while propogated in one direction toward your eye (i.e. become plane polarized light). The polarization in a sunglass lens will block out light rays oriented in a certain direction, giving you even more light blocking elements and definetly stops sun glare coming off water, ice, cars, reflective surfaces, etc. Which is why they are extremely popular in fishing sunglass lenses. Wear them inside a tinted car, if you can see the tint, they are polarized. Or put them on, and rotate your head clockwise, and if certain things become brighter, and certain things become darker, they are polarized. Or look through both sunglasses at the same time and rotate one, and if the amount of light coming in changes, they are polarized. Hate to say it, but most Tom Ford's are not polarized which always puzzles me. Persols are pretty much always polarized. It usually is unpolarized unless stated that it is. Whew.