Enjoy optical clarity with JetBlack's Svelto sunglasses. The frames are made from super-tough, super-light Thermo-plastic that has excellent resistance to cracking, high flexibility and fatigue strength. The shatterproof polycarbonate lenses are thin, light, give you 100% UV protection and are scratch resistant. Comfort and fit is assured by adjustable nose pads and their ergonomic design. The Xportal models come with extra Clear and Amber anti-glare lenses, and the Photochromic models automatically adapt to changing lighting conditions.