The Katana has an extremely quick and intuitive lens interchange system that allows you to swap lenses in just 6 seconds, to always have the perfect lens for any condition.The cylindrical lens and the ´´real no frame´´ technology bring the lens right up to the end of the frame increasing the field of view and the functionality.The Katana has all the high end features all Out Of´s goggles have:triple density foam, inner silicon grips with fading texture, second ´´Storm´´ lens specific for bad weather conditions included in the box.1 Extremely quick and easy lens interchange system:in just 6 seconds you can interchange lens to always have the best visibility .2 Second lens ´´Storm´´ specific for bad weather conditions included in the box.3 Zeiss lenses with Ri-pel hydrophobic and oleophobic treatment to have an unpaired optical quality.4 All the premium features Out Of´s goggles offer:premium anti-fog, anti-scratch treatment, triple density foam with hypoallergenic fleece, inner silicon grips with fading texture, wide field of view, ´´no-frame´´ design for an ´´all lens´´ look.