3M™ PELTOR™ Optime™ III Helmet Attach Earmuff H540P3GS/E, Black and Red, Class 5 SLC80 30dB 3M™ PELTOR™ Optime™ III Earmuffs, H540P3GS/E are a high performance hearing protector, developed for use in extremely noise environments like airports, marine engine rooms, power stations and print works. Compatible with 3M 25 mm hardhats and visors. Also includes 30 mm hard hat adapter. Reduces noise levels up to 30 dB 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