Fibre-Metal Tigerhood Classic Welding Helmet, #10, Gray, 2 in x 4-1/4 in Window (280-906GY) EachTelescoping lid provides a seal against light leak Tigerhood Classics unique design provides extended throat protection while blocking fumes and smoke from the face Size and shape allows air to circulate, to help clear any smoke and fumes that seep in Air circulation also evaporates perspiration in the perforated sweatband for a cooling effect If hazardous fumes are present, appropriate respirators must be worn