You may not have heard of 100% before, but we bet you'll be hearing a lot more from them in the future. While the Speedcraft may, at first glance, appear to mimic some sport sunglasses from decades past, that resemblance disappears upon further examination. The Speedcraft is a completely modern design that lends itself entirely to function. The first thing you notice about 100% Speedcraft sunglasses is the single lens design. Like moto goggles, the single lens is designed to provide the absolutely widest field of vision possible. There's no interference from an intrusive lens divider. The same is true of the top of the frame, which moves out of the way to increase your vertical field of vision. This is extremely important when you're in the riding position. It allows you to see what's ahead without tilting your head way back, which causes stiffness and pain literally in the neck.When you put the Speedcraft on your face, you'll notice that the lens sits a bit farther from your face than most sunglasses. This design forces a measured amount of air between the lens and your face to prevent fogging. The scoops on the temples augment this function, so your glasses won't fog, even during a slow grind up Mount Forever. Speaking of arduous climbs, 100% added a Megol hydrophilic nose pad to keep the sunglasses in place. In fact, the more you sweat, the better the glasses cling.Of course, you probably guessed that the lens is interchangeable. 100% was also kind enough to include an extra lens low light with the glasses, as well as an extra nosepiece, a micro fiber bag, and a molded carrying case.Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer andor birth defects or other reproductive harm.