DISTRICT VISION uses Japanese engineering to create each pair of glasses and tests them on a group of downtown runners to get real-time feedback. - These 'Koharu' sunglasses are made from ultra lightweight polycarbonate with a durable titanium core - Hypoallergenic rubber nosepads with sweat-repellent coating prevent them from slipping - Fitted with anti-reflective, shatterproof D+ Indigo Mirror lenses for infrared, UVA/B and blue light protection - Treated for an oil-and water-resistant finish