If really worried, do what we did in the mines and use foam earplugs inside grade 5 earmuffs. Worked a treat. Guys who wore none were deaf as posts after about 5 years on the pneumatic rock drills.
But if you are working in silly hot environments (Aussie outback) you have to pull your earmuffs away from your head every 10 minutes to drain the sweat out![]()
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