3M™ PELTOR™ Optime™ III Headband Format Earmuff H540A, Black and Red, Class 5 SLC80 33dB 3M™ PELTOR™ Optime™ III Earmuffs, H540A are a high performance hearing protector, developed for use in extremely noise environments like airports, marine engine rooms, power stations and print works. Reduces noise levels up to 33 dB Double casing technology minimises resonance effect Large space inside the cups helps minimise heat and moisture build-up Soft, wide, cushions help reduce pressure around the ears Cushions and inserts available as replacement Hygiene Kits