 clear as you can get, but they are very heavy. And nylon gives you the best of both worlds. It has the impact resistance, and it has the optical purity of glass. Furthermore, it's extremely light. So that whole pair of glasses in your hand, Keith, if you're holding them, that weighs less than one ounce. And a regular pair of sunglasses you're wearing might weigh three or four ounces. It's something, if you just throw them on for a second and take them off, you might not really pick up on.