Use these cap-mounted earmuffs in conjunction with MSA V-Gard® Full Brim Hard Hats. They are ideal for jobs in manufacturing, maintenance, construction, oil and gas, forestry, mining and the military. Muffs have three distinct wearing positions and can tip up and out-of-the-way when not in use. Product does not interfere with the ANSI Z89.1 Class E rating of a V-Gard Full Brim Hard Hat.