The Costa del Mar Ballast are incredibly lightweight and versatile. Coming in at a mere 16 grams (0.5 ounces), the Ballast frames avoid long-wearing fatigue around the ears and nose. Equipped with copper lenses, these frames are a good all-around pair for a wide variety of conditions – from bright to low light, and from driving to cycling. Thin, wrap-around frame arms offer a comfortable fit for medium faces. All Costa sunglasses come with the brand’s lightweight, scratch-, and impact-resistant 580P lens technology with 100% UV protection and polarization.