They may be flanged or cone-shaped and are often joined by a cord so that they're not easily lost. Reusable plugs can be worn safely for 1 to 6 months or more depending on the type. They should be replaced as soon as they become hard, torn, or deformed. Inspect and clean them often with warm soapy water. Store them in the case supplied by the manufacturer.
Earmuffs resemble stereo headphones.
The soft plastic cushions, filled with foam or liquid, should form a good seal against noise. If you wear glasses with wide temples, you may want to choose another type of protector. If you're exposed to very loud noise, you can wear earmuffs and plugs together. Wipe the cushions clean with a damp rag when they become soiled. Check the cushions often, and replace them if they're stiff, worn, cut, or torn.