D+ Black Rose lenses are an advanced sports lens engineered for trail running and physical pursuits that involve unpredictable light conditions. The lenses on the District Vision Explorer Gray Sunglasses only allow 15.6% to 35.15% of light through. Enhancing visibility in a variety of performance conditions. Tested by New York City athletes and made in Japan. This frame features D+ lens technology, which is an adjustable hypoallergenic rubber nose pad and temple tips with a titanium core. These sunglasses are some of the lightest and most comfortable sports frames out there.