The Bliz Tempo Sunglasses are all around performers for the highly active, whether you prefer cycling, skiing, running, or all the above. These sunglasses are completely customizable, with interchangeable lenses as well as interchangeable temple tips. Switch out the tips with the included goggle strap for a more snug fit. The Unbreakable Polycarbonate lenses are ten times more impact resistant than standard plastic or glass lenses. There are grippy pads at the temples and nose that you can adjust for a secure fit, and Bliz added a top bar that wicks sweat for extra comfort. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer andor birth defects or other reproductive harm.