Unisex sports sunglasses: The Alpina TWIST FIVE HR QV+ are modern photochromatic or self-darkening glasses. The lenses of this model have a polarizing Quattroflex filter that enhances colour contours and removes glare. The self-tinting covers all three protection categories, S1-S3, That means from completely clear to dark. With fogstop coating. The glasses have the possibility of adjusting the temples by means of a joint located at the junction of the temples and the lenses. You can customise the the nose piece width according to your head size for the most comfortable fit. Alpina Twist Five are lightweight sunglasses that can be worn for sports as well as casually.