This 4 inches visor from Cairns is standard on all modern helmets. (ASTM-D648 melting temperature of 325° F)
It offers a superior heat resistance and scratch resistance on traditionnal and deluxe helmets. (ASTM melting temperature of 345° F)
All Cairns visors come with protective wings for a greater facial protection. The protective wings are made of the same fire proof material than the facial protective equipment to offer an additionnal strength in high temperatures