UV Protection Category: 3. Polycarbonate: Polycarbonate is lightweight, comfortable, impact resistant, and provides UV protection. The MTX and KARBON TX™ injected temples are hand finished and non-slip hypoallergenic silicon nose pads. They are durable, lightweight and designed for comfort and fit.XTR Karbon8, this optical Class One lens provides Maximum protection against UVA/UVB and harmful blue light up to 400nm. Distortion free and impact resistant. Tested to BS EN ISO 12312-1:2013 A lens more suited for medium bright light conditions.