Polycarbonate: Polycarbonate is lightweight| comfortable| impact resistant| and provides UV protectionKARBON TX™ bi-core injected frames are hand finishedThey are flexible| durable| lightweight and designed for comfort| fit and performanceThe sports hinge provides both strength and performanceThe fully adjustable hypoallergenic nose pads and the non-slip hypoallergenic temple tips are designed for comfort and fitXTR Karbon8| optical Class One lens provides Maximum protection against UVA/UVB and harmful blue light up to 400nmDistortion free and impact resistantTested to BS EN ISO 12312-1:2013 A high definition lens ideally suited for medium to bright light conditionsThe vermilion tint helps with contrast against blue and green light