Conforms to EN 166 1 F T EN170. The new Twilight technology offers the advantages of ESP that filters 76% of blue light but with a double anti-fog coating (on both sides of the lenses) to prevent fogging in the most challenging conditions. Designed and used in low light conditions, it improves contrast. Its light transmission rate is perfect for indoors or outdoors, particularly early morning and late evening. Supplied with adjustable neck cord.