John Doe Ironhead sunglasses photochromicThe photochromic lenses of the John Doe Ironhead sunglasses with the self tint ability offer excellent visibility in any conditions. Under UV light they go from clear to light dark gray and vice versa within seconds; depending on the intensity. Durable frame construction and a modern design round off the whole package. Features:Polarized photochromic lensesExcellent comfortTint from light to dark grayShatterproof lens designUV 400 protection