Their new Kore sunglasses are the product of innovative materials and a ''function-first'' approach, bringing these glasses more to the level of a tool than a piece of eyewear. The design is lightweight, durable and ergonomically designed. Kore utilizes Kaenon's SR-91 lens material that has all the quality and durability of heavier glass lenses, but at nowhere near the weight. The glasses are available in large, medium and small sizes to guarantee optimum performance and maximum protection from wind, water, sand and dirt, and you can select from several lens colors to suit your preference and needs. Kore sunglasses utilize Kaenon's Glare 86 Polarizing technology, along with its proprietary Light Transmission Control technology that also provides lens color in several levels of darkness. You'll be amazed at the difference a darker or brighter lens can make, even in the same old color.