The Smith Parallel Max shares the lightness of their Vxe and Pivlock 90 series sunglasses; they're so unobtrusive you'll likely forget you're wearing them. The key difference is a matter of style. The Parallel Max has separate lenses where the aforementioned models use one full coverage eyeshield. This is also where the Max differs from the standard Parallel sunglasses. The lenses are just slightly taller and wider to offer a bit more coverage. We'd call the Parallel Max a close-fitting design. After all, the base curve of 9 ensures that the lenses sweep all the way around your eyes for optimum protection from unwanted light and glare as well as physical objects. The frame is made from Grilamid TR90, a tough plastic that is at once flexible, yet tough as nails. This lightweight frame supports individual lenses that pop out easily, like Smith's sliders of old. The lenses use Smith's Tapered Lens Technology (TLT) to give you a distortionless view. As you might've already experienced, visual distortion occurs when light waves hit an aggressively curved lens causing them to refract. This refraction causes a prismatic effect, or distortion. TLT corrects the distortion by progressively tapering the lens thickness from the optical center toward the peripheral edges. With TLT, light waves travel directly to your eye to generate precise vision and reduce potential eye fatigue. Objects are clearly defined and seen in their exact position. Seeing clearly adds safety, but so does Smith's Carbonic lens material - the most impact resistant lens material money can buy. Smith treats them with an anti-scratch coating to keep them as new as possible, as long as possible. They're light, they exceed ANSI Z80. 3 specifications, and they protect your eyes from 100% of the UVA, UVB, and UVC rays out there. The Grilamid TR90 frame provides you with maximum comfort, maximum flexibility, maximum toughness, and maximum resistance to sweat and sunscreen. And the hydrophilic Megol nose and.