The Aphex photochromatic lens allows a change of tint in a few seconds. Your lens can change from CAT.1 (white, cloudy day) to CAT.3 (sunshine), and vice versa. A unique Lens that covers many conditions, full sunshine or cloudy weather, impossible to go out without it when you have tried it! More respectful of the environment, from now on all our goggles frames are made of BioBased and recycled materials. The lens cover is finished in Revo Blue.